MLA

of State, United States. Dept. Greece [Cartographic Material] : Proposed Works for Water Economy, 1:1 600 000. United States. Dept. of State. Map Division, 1947. https://collections.library.yale.edu/catalog/15498865.

APA, 6th edition

of State, U. S. D. (1947). Greece [cartographic material] : proposed works for water economy, 1:1 600 000. [Maps]. United States. Dept. of State. Map Division, https://collections.library.yale.edu/catalog/15498865.