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MLA

United States Department of Agriculture. "Plant Inventory, 1918, No. 42 (39682-40388)." ,

APA

United States Department of Agriculture, U. States Department of Agriculture. (0000). Plant Inventory, 1918, no. 42 (39682-40388).

Chicago

United States Department of Agriculture. "Plant Inventory, 1918, no. 42 (39682-40388)" (1918):