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Particle size distribution measurements of a variety of materials over a range from 0.1 to 150 microns are presented. Computer data analysis provides plots of the cumulative weight-size distribution and the mass frequency distribution. The size range covered was accomplished by two sedimentation methods both yielding the Stokesian diameter. Centrifugal photosedimentation was used for fine particles and gravity sedimentation for coarse particles. The useful range of particle concentrations in dispersions for conducting repeatable measurements was determined for both methods of sedimentation. Results of supplementary investigations by microscope on the particle shape of the materials analyzed and other pertinent data are listed in an appendix.