Cite

Corsica [cartographic material] : special strategic map / compiled by the Army Map Service.

MLA

Service, United States. Army Map. Corsica [Cartographic Material] : Special Strategic Map / Compiled by the Army Map Service. Army Map Service, 0AD. https://collections.library.yale.edu/catalog/15487210.

APA, 6th edition

Service, U. S. A. M. (0 C.E.). Corsica [cartographic material] : special strategic map / compiled by the Army Map Service. [Maps]. Army Map Service, https://collections.library.yale.edu/catalog/15487210.