Varieties of alfalfa.
- [Rev.
- Washington, U.S. Govt. Print. Off., 1968]
- 12 p. illus. 24 cm.
- United States. Dept. of Agriculture. Farmers' bulletin ; no. 2231 .
- Farmers' bulletin (United States. Department of Agriculture) ; no. 2231. .
Revised ed. of its Alfalfa varieties and areas of adaptation, issued as U.S. Dept. of Agriculture. Leaflet no. 507.