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Upper Souris National Wildlife Refuge.

APA Citation

U.S. Fish and Wildlife Service. (2004). Upper Souris National Wildlife Refuge. [Washington, D.C.]: U.S. Fish and Wildlife Service.

U.S. Fish and Wildlife Service. Upper Souris National Wildlife Refuge. [Washington, D.C.]: U.S. Fish and Wildlife Service, 2004.

Warning: These citations may not always be complete (especially for serials).