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A brief history of the National park service.
United States Department of the Interior.

APA Citation

United States. National Park Service. (1940). A brief history of the National park service: United States Department of the Interior. Washington.

MLA Citation

United States. National Park Service. A Brief History of the National Park Service: United States Department of the Interior. Washington, 1940.

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