Cite

"Greater" Germany caves and cave regions.

MLA

of Strategic Services, United States. Office. "Greater" Germany Caves and Cave Regions. OSS, 1945. https://collections.library.yale.edu/catalog/15479618.

APA, 6th edition

of Strategic Services, U. S. O. (1945). "Greater" Germany caves and cave regions. [Maps]. OSS, https://collections.library.yale.edu/catalog/15479618.