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United States Department of Agriculture. "Plant Inventory, 1991, No. 199, Part I (536645-541499)." ,

APA

United States Department of Agriculture, U. States Department of Agriculture. (0000). Plant Inventory, 1991, no. 199, Part I (536645-541499).

Chicago

United States Department of Agriculture. "Plant Inventory, 1991, no. 199, Part I (536645-541499)" (1991):