APA (7th ed.) Citation

United States Naval Observatory. (1873). Washington zones. [publisher not identified].

Chicago Style (17th ed.) Citation

United States Naval Observatory. Washington Zones. [Washington]: [publisher not identified], 1873.

MLA (9th ed.) Citation

United States Naval Observatory. Washington Zones. [publisher not identified], 1873.

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