APA (7th ed.) Citation

United States. Army Map Service. (1950). British Guiana 1: 100,000. The Service.

Chicago Style (17th ed.) Citation

United States. Army Map Service. British Guiana 1: 100,000. Washington: The Service, 1950.

MLA (8th ed.) Citation

United States. Army Map Service. British Guiana 1: 100,000. The Service, 1950.

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