APA (7th ed.) Citation

U.S. Coast and Geodetic Survey. (1909). Results of observations made at Coast and Geodetic Survey magnetic observatory at Cheltenham, Md., 1909 and 1910. GPO.

Chicago Style (17th ed.) Citation

U.S. Coast and Geodetic Survey. Results of Observations Made at Coast and Geodetic Survey Magnetic Observatory at Cheltenham, Md., 1909 and 1910. [Washington]: GPO, 1909.

MLA (9th ed.) Citation

U.S. Coast and Geodetic Survey. Results of Observations Made at Coast and Geodetic Survey Magnetic Observatory at Cheltenham, Md., 1909 and 1910. GPO, 1909.