APA (7th ed.) Citation

U.S. Coast and Geodetic Survey. (1932). Magnetic declination in U.S., 1930. GPO.

Chicago Style (17th ed.) Citation

U.S. Coast and Geodetic Survey. Magnetic Declination in U.S., 1930. [Washington]: GPO, 1932.

MLA (9th ed.) Citation

U.S. Coast and Geodetic Survey. Magnetic Declination in U.S., 1930. GPO, 1932.

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