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MLA

United States Department of Agriculture. Plant Inventory, 1917, no. 40 (38666-39308). , 1917.

APA

United States Department of Agriculture. (1917). Plant Inventory, 1917, no. 40 (38666-39308). .

Chicago

United States Department of Agriculture. Plant Inventory, 1917, no. 40 (38666-39308). , 1917.