USDA soil taxonomy

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What Wikipedia says

USDA soil taxonomy (ST), developed by the United States Department of Agriculture and the National Cooperative Soil Survey, provides an elaborate classification of soil types according to several parameters (most commonly their properties) and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series.

Excerpt from the Wikipedia article “USDA soil taxonomy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia