Keys to Soil Taxonomy
http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/class/?cid=nrcs142p2_053580


This United States Department of Agriculture (USDA) publication (9th edition, 2003) contains taxonomic keys necessary for the classification of soils in a form easily used in the field. The book describes soils in general, how to differentiate between them, and how the identification process works. The taxonomic key includes all known soil types, including mollisols, oxisols, alfisols, and others.

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DLESE
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Subject: Biology, Geoscience:Geology
Grade Level: Graduate/Professional, College Upper (15-16), College Lower (13-14)