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Helms, D. (2002) Early Leaders of the Soil Survey. In: Helms, D., Effland, A.B.W. and Durana, P.J., Eds., Profiles in the History of the U.S. Soil Surevy, Lowa State University Press, Ames, 19-64.
https://doi.org/10.1002/9780470376959.ch2

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