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Soil formation > United States

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1.
From the surface down : an introduction to soil surveys for agronomic use
Author
Broderson, William D.
Published
[Washington, D.C.] : United States Department of Agriculture, Natural Resources Conservation Service, 2010.
Online
https://purl.fdlp.gov/GPO/gpo93908
Location
Yale Internet Resource >> None
Format
Books / Online
2.
Development and significance of the great soil groups of the United States
Author
Kellogg, Charles E. (Charles Edwin), 1902-
Published
Washington, D.C. : U.S. Dept. of Agriculture, 1936.
Online
Online book
no.229(1936)
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online