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- Piper, Charles V. (Charles Vancouver) and Pieters, A. J.
- Farmers' bulletin (United States. Dept. of Agriculture) ; no. 1250 1922
- Green manuring, green manures, cover crops, nitrogen fixation, soil nutrients, soil fertility, nitrogen, legumes, soil inoculation, nitrification, soybeans, grasses, grain crops, tillage, soil pH, and Trifolium lappaceum
- 45 p. : ill., 1 map ; 23 cm.
- U.S. Dept. of Agriculture
- Organic Roots Collection