MLA

Service, United States. Grazing. Grazing Districts under Taylor Grazing Act / United States Department of the Interior, Grazing Service. The Service, 1940. https://collections.library.yale.edu/catalog/15812992.

APA, 6th edition

Service, U. S. G. (1940). Grazing districts under Taylor Grazing Act / United States Department of the Interior, Grazing Service. [Maps]. The Service, https://collections.library.yale.edu/catalog/15812992.