APA (7th ed.) Citation

United States. Railway Mail Service. (1906). General scheme of Pennsylvania, July 1, 1906. GPO.

Chicago Style (17th ed.) Citation

United States. Railway Mail Service. General Scheme of Pennsylvania, July 1, 1906. [Washington]: GPO, 1906.

MLA (9th ed.) Citation

United States. Railway Mail Service. General Scheme of Pennsylvania, July 1, 1906. GPO, 1906.

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