APA Citation

United States. Army Map Service. (1954). El Salvador 1: 50,000 (Ed.1-AMS.). [Washington, D.C.?]: The Service.

Chicago Style Citation

United States. Army Map Service. El Salvador 1: 50,000. Ed.1-AMS. [Washington, D.C.?]: The Service, 1954.

MLA Citation

United States. Army Map Service. El Salvador 1: 50,000. Ed.1-AMS. [Washington, D.C.?]: The Service, 1954.

Warning: These citations may not always be 100% accurate.