APA (7th ed.) Citation

U.S. Geological Survey Library & Sasscer, R. S. (1992). U.S. Geological Survey Library classification system. U.S. G.P.O. ; For sale by Book and Open-File Report Sales, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

U.S. Geological Survey Library and R. Scott Sasscer. U.S. Geological Survey Library Classification System. Washington, D.C. : Denver, CO: U.S. G.P.O. ; For sale by Book and Open-File Report Sales, U.S. Geological Survey, 1992.

MLA (8th ed.) Citation

U.S. Geological Survey Library and R. Scott Sasscer. U.S. Geological Survey Library Classification System. U.S. G.P.O. ; For sale by Book and Open-File Report Sales, U.S. Geological Survey, 1992.

Warning: These citations may not always be 100% accurate.