Geological Survey (U.S.). (1950). Colorado, 7.5 minute series (topographic). U.S. Geological Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.). Colorado, 7.5 Minute Series (topographic). Reston, Va.: U.S. Geological Survey, 1950.
MLA (9th ed.) CitationGeological Survey (U.S.). Colorado, 7.5 Minute Series (topographic). U.S. Geological Survey, 1950.
Warning: These citations may not always be 100% accurate.