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United States Department of Agriculture. "Plant Inventory, 1931, No. 100 (80811-81619)." ,

APA

United States Department of Agriculture, U. States Department of Agriculture. (0000). Plant Inventory, 1931, no. 100 (80811-81619).

Chicago

United States Department of Agriculture. "Plant Inventory, 1931, no. 100 (80811-81619)" (1931):