Cite

Railroads of western U.S.S.R. : showing railroad administrative divisions, southern section.

MLA

United States. Office of Strategic Services. Reproduction Branch, United States. Office of Strategic Services. Research, and Analysis Branch. Railroads of Western U.S.S.R. : Showing Railroad Administrative Divisions, Southern Section. Reproduction Branch, OSS, 0AD. https://collections.library.yale.edu/catalog/15475628.

APA, 6th edition

United States. Office of Strategic Services. Reproduction Branch, U. S. O. of S. S. R., & Branch, A. (0 C.E.). Railroads of western U.S.S.R. : showing railroad administrative divisions, southern section. [Maps]. Reproduction Branch, OSS, https://collections.library.yale.edu/catalog/15475628.