APA (7th ed.) Citation

U.S. Coast and Geodetic Survey. (1926). Instructions to light keepers on 1st-order triangulation. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

U.S. Coast and Geodetic Survey. Instructions to Light Keepers on 1st-order Triangulation. [Washington?]: U.S. Government Printing Office, 1926.

MLA (9th ed.) Citation

U.S. Coast and Geodetic Survey. Instructions to Light Keepers on 1st-order Triangulation. U.S. Government Printing Office, 1926.