Geological Survey (U.S.). (1976). National topographic maps 1: 250,000-scale series. Geological Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.). National Topographic Maps 1: 250,000-scale Series. Reston, Va.: Geological Survey, 1976.
MLA (9th ed.) CitationGeological Survey (U.S.). National Topographic Maps 1: 250,000-scale Series. Geological Survey, 1976.
Warning: These citations may not always be 100% accurate.