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Figure 7 <br />• USDA TEXTURAL CLASSIFICATION OF SOILS <br />0 0 0 0 0 ''o <br />COMPARISON OF PARTICLE SIZE SCALES <br />Sieve Openings in Inches U. S. Standard Sieve Numbers <br />3 2 ] 3- ' : 4 10 20 40 Gn 200 <br />ap o <br />IFIE0 <br />F <br />GRAVEL <br />SAND <br />SILT OR CLAY <br />1. Coarse Fine <br />USDA <br />GRAVEL' _ <br />SILT <br />CLAY <br />Ftne <br />Sell <br />CIA, <br />Coarse <br />Coarse <br />►{colts <br />Fine fine <br />IFIE0 <br />F <br />GRAVEL <br />SAND <br />SILT OR CLAY <br />1. Coarse Fine <br />Coarse H cdtum F,ne <br />III I LLL_!____ I 1 111 1 1 1 I <br />—18 <br />GRAVEL OR STONE <br />SAND <br />SILT — CLAY <br />AASHO <br />Codrse <br />meottra <br />Fine <br />Coarse <br />Ftne <br />Sell <br />CIA, <br />III I LLL_!____ I 1 111 1 1 1 I <br />—18 <br />