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R. Webster, Soil Classification in the United States: A Short Review of the Seventh Approximation, The Geographical Journal, Vol. 134, No. 3 (Sep., 1968), pp. 394-396 ...
Sand grains, according to the standards body ASTM International's Unified Soil Classification System, are soil particles having a diameter of 0.003 inches (0.075 mm) to 0.187 inches (4.75 mm).
Jack H. Faber, Functional Classification of Soil Fauna: A New Approach, Oikos, Vol. 62, No. 1 (Oct., 1991), pp. 110-117 ...
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