APA (7th ed.) Citation

U.S. Coast and Geodetic Survey. (1921). Results of magnetic observations made by U.S. Coast and Geodetic Survey in 1921. GPO.

Chicago Style (17th ed.) Citation

U.S. Coast and Geodetic Survey. Results of Magnetic Observations Made by U.S. Coast and Geodetic Survey in 1921. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

U.S. Coast and Geodetic Survey. Results of Magnetic Observations Made by U.S. Coast and Geodetic Survey in 1921. GPO, 1921.