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MLA

United States Department of Agriculture. Plant Inventory, 1920, no. 47 (42384-43012). , 1920.

APA

United States Department of Agriculture. (1920). Plant Inventory, 1920, no. 47 (42384-43012). .

Chicago

United States Department of Agriculture. Plant Inventory, 1920, no. 47 (42384-43012). , 1920.