Contours of change.

Contours of change. - [Washington For sale by the Supt. of Docs. 1970] - xl, 366 p. illus. - Its Yearbook of agriculture 1970 . - Yearbook of agriculture (Washington, D.C. : 1926) 1970. .

79609702 //r892


Agriculture--United States.

S21 / .A35 1970

338.1/0973
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