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by C.W. Collins, and Clifford E. Hood
United States. Department of Agriculture 1931 Circular / United States Department of Agriculture no. 189
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by Clifford E. Hood
United States Department of Agriculture 1929 Technical bulletin / United States Department of Agriculture no. 111
Clifford E. Hood
Government Printing Office 1926 Department Bulletin / United States Department of Agriculture No. 1439