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Profiles in the History of the U.S. Soil Survey [Monograph]
Helms, D. \ Effland, A.B.W. \ Durana, P.J. \ 2002
soil science - soil classification - soil types - geomorphology - United States
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Soil and Southern History. (Agricultural History, Vol. 74, Issue no. 4, pages 723-758. [Monograph]
Helms, D. \ 2000
agriculture - United States
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