Explore: Sprachstorung
Discover books, insights, and more — all in one place.
Learn more about Sprachstorung with top reads curated from trusted sources — all in one place.
AI-Generated Overview About “sprachsto%C2%98rung”:
Books Results
Source: The Open Library
The Open Library Search Results
Search results from The Open Library
1Diagnosis and evaluation in speech pathology
By Lon L. Emerick

“Diagnosis and evaluation in speech pathology” Metadata:
- Title: ➤ Diagnosis and evaluation in speech pathology
- Author: Lon L. Emerick
- Language: English
- Number of Pages: Median: 365
- Publisher: Prentice-Hall
- Publish Date: 1974 - 1978 - 1979 - 1986
- Publish Location: Englewood Cliffs, N.J
“Diagnosis and evaluation in speech pathology” Subjects and Themes:
- Subjects: ➤ Speech disorders - Disorders of Speech - Case studies - Speech, Disorders of - Diagnosis - Diagnose - Sprachstorung - Speech Disorders
Edition Identifiers:
- The Open Library ID: OL4725905M - OL5422596M - OL21627371M - OL2531748M
- Online Computer Library Center (OCLC) ID: 12235768 - 714279
- Library of Congress Control Number (LCCN): 73016372 - 85012390 - 78013593
- All ISBNs: ➤ 9780132085120 - 032085127 - 0132086468 - 0132085127 - 0132084708 - 9780132086462 - 9780132084703
Access and General Info:
- First Year Published: 1974
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Diagnosis and evaluation in speech pathology at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
2Aphasia and related neurogenic language disorders
By Leonard L. LaPointe

“Aphasia and related neurogenic language disorders” Metadata:
- Title: ➤ Aphasia and related neurogenic language disorders
- Author: Leonard L. LaPointe
- Language: English
- Number of Pages: Median: 278
- Publisher: ➤ Thieme - Thieme Medical Publishers - G. Thieme Verlag - Thieme Medical Publishers, Incorporated
- Publish Date: 1990 - 1997 - 2018
- Publish Location: Stuttgart - New York
“Aphasia and related neurogenic language disorders” Subjects and Themes:
- Subjects: ➤ Central Nervous System Diseases - Language Disorders - Complications - Diseases - Central nervous system - Aphasia - Language disorders - Complications et sequelles - Systeme nerveux central - Systeme nerveux central - Maladies - Complications et sequelles - Krankheit - Patholinguistik - Troubles du Langage - Maladies - Aphasie - Sprachstorung - Zentralnervensystem - Central nervous system, diseases
Edition Identifiers:
- The Open Library ID: OL29367416M - OL1858211M - OL982113M
- Online Computer Library Center (OCLC) ID: 20995464 - 34710827
- Library of Congress Control Number (LCCN): 96019737 - 90010721
- All ISBNs: ➤ 0865776229 - 9783137477020 - 3137477026 - 9780865776227 - 9780865773141 - 0865773149 - 9781626234413 - 1626234418
Access and General Info:
- First Year Published: 1990
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Aphasia and related neurogenic language disorders at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
3Nonspeech language and communication
By Nonspeech Language Conference (1977 Gulf Shores, Ala.)

“Nonspeech language and communication” Metadata:
- Title: ➤ Nonspeech language and communication
- Author: ➤ Nonspeech Language Conference (1977 Gulf Shores, Ala.)
- Language: English
- Number of Pages: Median: 529
- Publisher: University Park Press
- Publish Date: 1980
- Publish Location: Baltimore
“Nonspeech language and communication” Subjects and Themes:
- Subjects: ➤ Children with disabilities - Congresses - Language - Language disorders in children - Nonverbal communication - Langage - Gehandicapte kinderen - Non-verbale communicatie - Child - Kind - Nonverbal Communication - Congres - Gebardensprache - Infant - Communication non-verbale - Gehandicapten - Nichtverbale Kommunikation - Disabled Persons - Langage, Troubles du, chez l'enfant - Kinderen - Sprachstorung - Enfants handicapes - Language Disorders - Taalstoornissen
Edition Identifiers:
- The Open Library ID: OL4421779M - OL8224503M
- Library of Congress Control Number (LCCN): 79026190
- All ISBNs: 083911558X - 9780839115588
Access and General Info:
- First Year Published: 1980
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Nonspeech language and communication at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
4Phonology
By Mary Louise Edwards

“Phonology” Metadata:
- Title: Phonology
- Author: Mary Louise Edwards
- Language: English
- Number of Pages: Median: 413
- Publisher: College-Hill Press
- Publish Date: 1983
- Publish Location: San Diego, Calif
“Phonology” Subjects and Themes:
- Subjects: ➤ Communicative disorders - Comparative and general Grammar - Language acquisition - Phonology - Langage - Acquisition - Langage - Phonetics - Troubles de la Communication - Speech Disorders - Spracherwerb - Acquisition - Kommunikationsstorung - Sprachstorung - Phonologie - Voice Disorders - Language Development - Language Disorders
Edition Identifiers:
- The Open Library ID: OL3504823M
- Library of Congress Control Number (LCCN): 82025299
- All ISBNs: 9780933014800 - 0933014805
Access and General Info:
- First Year Published: 1983
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Phonology at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
5Children with specific speech and language impairment
By Corrinne Hayes, Corinne Haynes and Sandhya Naidoo

“Children with specific speech and language impairment” Metadata:
- Title: ➤ Children with specific speech and language impairment
- Authors: Corrinne HayesCorinne HaynesSandhya Naidoo
- Language: English
- Number of Pages: Median: 289
- Publisher: ➤ Cambridge University Press - Mac Keith
- Publish Date: 1991
“Children with specific speech and language impairment” Subjects and Themes:
- Subjects: ➤ Child development - Speech disorders in children - Language disorders in children - Paediatric medicine - Pediatrics - Speech Disorders (Medical Aspects) - Medical / Nursing - Health/Fitness - Medical / Pediatrics - Infant - Language Development Disorders - Longitudinal Studies - Kind - Langage, Troubles du, chez l'enfant - Speech Disorders - Child Development - Parole, Troubles de la, chez l'enfant - Sprachstorung - Child - Spraakstoornissen - Language Disorders - Sprechstorung
Edition Identifiers:
- The Open Library ID: OL21503069M - OL7739949M
- Online Computer Library Center (OCLC) ID: 26587947 - 24635813
- All ISBNs: 9780521412759 - 0521412757
Access and General Info:
- First Year Published: 1991
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Children with specific speech and language impairment at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
6Teaching functional language
By Steven F. Warren

“Teaching functional language” Metadata:
- Title: Teaching functional language
- Author: Steven F. Warren
- Language: English
- Number of Pages: Median: 351
- Publisher: University Park Press
- Publish Date: 1985
- Publish Location: Baltimore
“Teaching functional language” Subjects and Themes:
- Subjects: ➤ Kind - Language Development Disorders - Language - Langage - Language Therapy - Therapie - Logopadie - Infant - Methods - Langage, Troubles du, chez l'enfant - Sprachstorung - Language disorders in children - Child - Language Disorders - Enfants - Children
Edition Identifiers:
- The Open Library ID: OL2858339M
- Library of Congress Control Number (LCCN): 84020998
- All ISBNs: 0839117981 - 9780839117988
Access and General Info:
- First Year Published: 1985
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Teaching functional language at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
7Psychiatric and developmental disorders in children with communication disorder
By Dennis P. Cantwell

“Psychiatric and developmental disorders in children with communication disorder” Metadata:
- Title: ➤ Psychiatric and developmental disorders in children with communication disorder
- Author: Dennis P. Cantwell
- Language: English
- Number of Pages: Median: 308
- Publisher: American Psychiatric Press
- Publish Date: 1991
- Publish Location: Washington, DC
“Psychiatric and developmental disorders in children with communication disorder” Subjects and Themes:
- Subjects: ➤ Children with disabilities - Cohort Studies - Complications - Development - In infancy & childhood - Language Development Disorders - Language disorders in children - Mental Disorders - Mental health - Patients - Research - Speech disorders - Speech disorders in children - Recherche - Developpement - Parole, Troubles de la, chez l'enfant - Child - Psychische Storung - Infant - Langage, Troubles du, chez l'enfant - Kind - Sprachstorung - Sante mentale - Enfants handicapes - Communicative disorders in children - Child psychiatry - Child psychology
Edition Identifiers:
- The Open Library ID: OL1861056M
- Online Computer Library Center (OCLC) ID: 22665330
- Library of Congress Control Number (LCCN): 90014486
- All ISBNs: 0880483571 - 9780880483575
Access and General Info:
- First Year Published: 1991
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Psychiatric and developmental disorders in children with communication disorder at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
8Children with language disabilities
By Michael Beveridge

“Children with language disabilities” Metadata:
- Title: ➤ Children with language disabilities
- Author: Michael Beveridge
- Language: English
- Number of Pages: Median: 116
- Publisher: Open University Press
- Publish Date: 1987
- Publish Location: ➤ Milton Keynes, [Buckinghamshire], England - Philadelphia
“Children with language disabilities” Subjects and Themes:
- Subjects: ➤ Education - Language - Language arts - Learning disabled children - Oral communication - Study and teaching - Langage - Enfants en difficulte d'apprentissage - Sonderpadagogik - Kind - Sprachstorung - Etude et enseignement - Communication orale - Language Disorders - Child Language
Edition Identifiers:
- The Open Library ID: OL2377386M
- Online Computer Library Center (OCLC) ID: 15628080
- Library of Congress Control Number (LCCN): 87005779
- All ISBNs: 9780335102792 - 9780335102808 - 0335102808 - 0335102794
Access and General Info:
- First Year Published: 1987
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Children with language disabilities at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
9Legal aspects of speech-language pathology and audiology
By Franklin H. Silverman

“Legal aspects of speech-language pathology and audiology” Metadata:
- Title: ➤ Legal aspects of speech-language pathology and audiology
- Author: Franklin H. Silverman
- Language: English
- Number of Pages: Median: 225
- Publisher: Prentice-Hall
- Publish Date: 1983
- Publish Location: Englewood Cliffs, N.J
“Legal aspects of speech-language pathology and audiology” Subjects and Themes:
- Subjects: ➤ Audiologists - Rechtsmedizin - Legislation - Speech Therapy - Audiology - Sprachstorung - Legal status, laws - Speech-Language Pathology - Speech therapists
Edition Identifiers:
- The Open Library ID: OL3491476M
- Online Computer Library Center (OCLC) ID: 8553347
- Library of Congress Control Number (LCCN): 82011280
- All ISBNs: 9780135281093 - 0135281091
Access and General Info:
- First Year Published: 1983
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Legal aspects of speech-language pathology and audiology at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
10Lang Learn and Comm Disor Chld
By Wyatt

“Lang Learn and Comm Disor Chld” Metadata:
- Title: Lang Learn and Comm Disor Chld
- Author: Wyatt
- Language: English
- Number of Pages: Median: 456
- Publisher: Free Press
- Publish Date: 1969
“Lang Learn and Comm Disor Chld” Subjects and Themes:
- Subjects: ➤ Langage - Language - Infant - Communicatiestoornissen - Taalverwerving - Communication, Troubles de la, chez l'enfant - Psychologie - Logopadie - Communicative disorders in children - Kind - Sprachentwicklungsstorung - Sprachstorung - Child - Language Development - Language Disorders - Enfants - Children - Communication Disorders - Language Development Disorders - Children, language - Communicative disorders
Edition Identifiers:
- The Open Library ID: OL9937264M
- Online Computer Library Center (OCLC) ID: 1814
- Library of Congress Control Number (LCCN): 68028371
- All ISBNs: 9780029355503 - 0029355508
Access and General Info:
- First Year Published: 1969
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Lang Learn and Comm Disor Chld at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
11Evaluation of appraisal techniques in speech and language pathology
By Frederic L. Darley

“Evaluation of appraisal techniques in speech and language pathology” Metadata:
- Title: ➤ Evaluation of appraisal techniques in speech and language pathology
- Author: Frederic L. Darley
- Language: English
- Number of Pages: Median: 274
- Publisher: Addison-Wesley
- Publish Date: 1979
- Publish Location: Reading, MA
“Evaluation of appraisal techniques in speech and language pathology” Subjects and Themes:
- Subjects: ➤ Language Tests - Speech Disorders - Speech Discrimination Tests - Diagnosis - Troubles du Langage - Diagnose - Infant - Speech Articulation Tests - Langage, Troubles du, chez l'enfant - Speech disorders in children - Diagnostic - Sprachstorung - Speech Production Measurement - Child - Language Disorders
Edition Identifiers:
- The Open Library ID: OL4732269M
- Online Computer Library Center (OCLC) ID: 4515996
- Library of Congress Control Number (LCCN): 78020918
- All ISBNs: 9780201012767 - 0201012766
Access and General Info:
- First Year Published: 1979
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Evaluation of appraisal techniques in speech and language pathology at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
12Language competence
By Richard L. Schiefelbusch

“Language competence” Metadata:
- Title: Language competence
- Author: Richard L. Schiefelbusch
- Language: English
- Number of Pages: Median: 293
- Publisher: College-Hill Press
- Publish Date: 1986
- Publish Location: San Diego, Calif
“Language competence” Subjects and Themes:
- Subjects: ➤ Kind - Language Development Disorders - Diagnosis - Child - Langage, Troubles du, chez l'enfant - Communicative competence - Treatment - Competence de communication (Linguistique) - Competence and performance (Linguistics) - Kommunikative Kompetenz - Infant - Communication - Diagnostic - Competence et performance (Linguistique) - Sprachstorung - Language disorders in children - Traitement
Edition Identifiers:
- The Open Library ID: OL2542597M
- Online Computer Library Center (OCLC) ID: 12668856
- Library of Congress Control Number (LCCN): 85024277
- All ISBNs: 9780887442261 - 0887442269
Access and General Info:
- First Year Published: 1986
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Borrowable
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Language competence at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
13Childhood language disorders in context
infancy through adolescence
By Nickola Nelson

“Childhood language disorders in context” Metadata:
- Title: ➤ Childhood language disorders in context
- Author: Nickola Nelson
- Language: English
- Number of Pages: Median: 611
- Publisher: ➤ Merrill - Maxwell Macmillan Canada - Allyn & Bacon - Maxwell Macmillan International
- Publish Date: 1993 - 1998
- Publish Location: Toronto - Boston - New York
“Childhood language disorders in context” Subjects and Themes:
- Subjects: ➤ Language disorders in children - Language disorders in adolescence - Infant - Adolescent - Kind - Heranwachsender - Sprachstorung - Child - Language Disorders
Edition Identifiers:
- The Open Library ID: OL1703641M - OL685626M
- Online Computer Library Center (OCLC) ID: 37836851 - 97032508
- Library of Congress Control Number (LCCN): 92004781 - 97032508
- All ISBNs: 0675212030 - 9780205197873 - 9780675212038 - 0205197876
Access and General Info:
- First Year Published: 1993
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Printdisabled
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
Online Marketplaces
Find Childhood language disorders in context at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
14Speech and language difficulties in the classroom
By Deirdre Martin

“Speech and language difficulties in the classroom” Metadata:
- Title: ➤ Speech and language difficulties in the classroom
- Author: Deirdre Martin
- Language: English
- Number of Pages: Median: 181
- Publisher: ➤ David Fulton Publish - D. Fulton Publishers
- Publish Date: 1996 - 2003
- Publish Location: London
“Speech and language difficulties in the classroom” Subjects and Themes:
- Subjects: ➤ Speech therapy for children - Language disorders in children - Sprachstorung - Kinderen - Taalproblemen - Schuler - Onderwijs - Speech disorders in children - Aphasic children - Education - Special education - Special Education - Troubles de la parole chez l'enfant - Troubles du langage chez l'enfant - Enfants aphasiques - Éducation - Éducation spéciale - Sprachstörung - Schüler - Speech therapy
Edition Identifiers:
- The Open Library ID: OL551305M - OL9357739M
- Online Computer Library Center (OCLC) ID: 34669620
- Library of Congress Control Number (LCCN): 96132722
- All ISBNs: 9781853468452 - 1853463027 - 9781853463020 - 1853468452
First Setence:
"In this book we are interested in human communication."
Access and General Info:
- First Year Published: 1996
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Printdisabled
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
Online Marketplaces
Find Speech and language difficulties in the classroom at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
15The Learning of language
By Carroll E. Reed

“The Learning of language” Metadata:
- Title: The Learning of language
- Author: Carroll E. Reed
- Language: English
- Number of Pages: Median: 430
- Publisher: Appleton-Century-Crofts
- Publish Date: 1971
- Publish Location: New York
“The Learning of language” Subjects and Themes:
- Subjects: ➤ Fremdsprachenlernen - Study and teaching - Langage et langues - Sprachstorung - Taalverwerving - Spracherwerb - Etude et enseignement - Language and languages - Aufsatzsammlung
Edition Identifiers:
- The Open Library ID: OL5078136M
- Online Computer Library Center (OCLC) ID: 211345
- Library of Congress Control Number (LCCN): 74135996
- All ISBNs: 9780390729644 - 0390729647
Access and General Info:
- First Year Published: 1971
- Is Full Text Available: Yes
- Is The Book Public: No
- Access Status: Printdisabled
Online Access
Downloads Are Not Available:
The book is not public therefore the download links will not allow the download of the entire book, however, borrowing the book online is available.
Online Borrowing:
Online Marketplaces
Find The Learning of language at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.
16Sermons...
By Geraldine P. Wallach and Katharine G. Butler

“Sermons...” Metadata:
- Title: Sermons...
- Authors: Geraldine P. WallachKatharine G. Butler
- Language: English
- Number of Pages: Median: 378
- Publisher: Williams & Wilkins
- Publish Date: 1984
- Publish Location: Baltimore, MD
“Sermons...” Subjects and Themes:
- Subjects: ➤ Reading disability - Legasthenie - Langage - Lernbehinderung - Therapie - Kind - Learning disabilities - Schulkind - Infant - Communication orale - Enfants en difficulte d'apprentissage - Remedial teaching - Langage, Troubles du, chez l'enfant - Education - Lesestorung - Sprachstorung - Language disorders in children - Child - Language Disorders - Leermoeilijkheden - Taalstoornissen - In infancy and childhood - Learning disorders
Edition Identifiers:
- The Open Library ID: OL3159703M
- Library of Congress Control Number (LCCN): 83001377
- All ISBNs: 068308707X - 9780683087079
Access and General Info:
- First Year Published: 1984
- Is Full Text Available: Yes
- Is The Book Public: Yes
- Access Status: Public
Online Access
Online Borrowing:
- Borrowing from Open Library: Borrowing link
- Borrowing from Archive.org: Borrowing link
Online Marketplaces
Find Sermons... at online marketplaces:
- Amazon: Audiable, Kindle and printed editions.
- Ebay: New & used books.