Science for better living.
- [Washington, For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1968]
- xlvi, 386 p. illus. (part col.) ports. 24 cm.
- Its Yearbook of agriculture, 1968 .
- Yearbook of agriculture (Washington, D.C. : 1926) ; 1968. .