Dept. of Agriculture. (1970). Contours of change. [Washington: For sale by the Supt. of Docs..
शिकागो स्टाइल उद्धरणDept. of Agriculture. Contours of Change. [Washington: For sale by the Supt. of Docs., 1970.
एमएलए उद्धरणDept. of Agriculture. Contours of Change. [Washington: For sale by the Supt. of Docs., 1970.
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