Standard field tables and trigonometric formulas :
a supplement to the Manual of instructions for the survey of the public lands of the United States.
APA Citation
United States. General Land Office. (1939). Standard field tables and trigonometric formulas: a supplement to the Manual of instructions for the survey of the public lands of the United States. 5th ed., Washington: U.S. GPO.
MLA Citation
United States. General Land Office. Standard Field Tables And Trigonometric Formulas: a Supplement to the Manual of Instructions for the Survey of the Public Lands of the United States. 5th ed., Washington: U.S. GPO, 1939.