APA (7th ed.) Citation

U.S. Coast and Geodetic Survey. (1930). Progress of seismological investigations in U.S., July 1, 1927 to Jan. 1, 1930. GPO.

Chicago Style (17th ed.) Citation

U.S. Coast and Geodetic Survey. Progress of Seismological Investigations in U.S., July 1, 1927 to Jan. 1, 1930. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

U.S. Coast and Geodetic Survey. Progress of Seismological Investigations in U.S., July 1, 1927 to Jan. 1, 1930. GPO, 1930.