Cite

Belgium, railroads / compiled and drawn in the Branch of Research and Analysis, OSS.

MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Belgium, Railroads / Compiled and Drawn in the Branch of Research and Analysis, OSS. O.S.S. Repro. Section, 1943. https://collections.library.yale.edu/catalog/15352342.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1943). Belgium, railroads / compiled and drawn in the Branch of Research and Analysis, OSS. [Maps]. O.S.S. Repro. Section, https://collections.library.yale.edu/catalog/15352342.