Greece [cartographic material] : roads and ports.
MLA
of Strategic Services. Research, United States. Office, and Analysis Branch. Greece [Cartographic Material] : Roads and Ports. Lithographed in the Reproduction Branch, OSS, 1944. https://collections.library.yale.edu/catalog/15498866.
APA, 6th edition
of Strategic Services. Research, U. S. O., & Branch, A. (1944). Greece [cartographic material] : roads and ports. [Maps]. Lithographed in the Reproduction Branch, OSS, https://collections.library.yale.edu/catalog/15498866.