APA (7th ed.) Citation

United States. Railway Mail Service. (1903). General scheme of Maryland and D.C., Apr. 1903. GPO.

Chicago Style (17th ed.) Citation

United States. Railway Mail Service. General Scheme of Maryland and D.C., Apr. 1903. [Washington]: GPO, 1903.

MLA (9th ed.) Citation

United States. Railway Mail Service. General Scheme of Maryland and D.C., Apr. 1903. GPO, 1903.

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