APA (7th ed.) Citation

United States. Railway Mail Service. (1900). General scheme of Colorado, Jan. 1900. GPO.

Chicago Style (17th ed.) Citation

United States. Railway Mail Service. General Scheme of Colorado, Jan. 1900. [Washington]: GPO, 1900.

MLA (9th ed.) Citation

United States. Railway Mail Service. General Scheme of Colorado, Jan. 1900. GPO, 1900.

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