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- Piper, Charles V. (Charles Vancouver), McKee, Roland, and Hillman, F. H. (Fred Hebard)
- Vetch, Seeds, cover crops, green manures, forage legumes, hay, seed collecting, and pasture plants
- 28 p. : ill., 1 map, ; 23 cm.
- U.S. Dept. of Agriculture
- Farmers' bulletin (United States. Dept. of Agriculture) ; no. 515
- Organic Roots Collection
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