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According to the U. S. Department of Agriculture Soil Texture Classification system, the sand-silt distinction is made at the 0. 05 mm particle size.

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According to the U. S. Department of Agriculture ( USDA ), the total number of animals used in that country in 2005 was almost 1. 2 million, but this does not include rats and mice, which make up about 90 % of research animals.

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According to the U. S. Department of Agriculture, in 2006 about 670, 000 animals ( 57 %) ( not including rats, mice, birds, or invertebrates ) were used in procedures that did not include more than momentary pain or distress.

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