Geological Survey (U.S.) & Hail, W. J., Jr. (1987). Reconnaissance geologic map of the Colona quadrangle, Montrose and Ouray counties, Colorado. The Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and William J. Hail, Jr. Reconnaissance Geologic Map of the Colona Quadrangle, Montrose and Ouray Counties, Colorado. Reston, Va.: The Survey, 1987.
MLA (9th ed.) CitationGeological Survey (U.S.) and William J. Hail, Jr. Reconnaissance Geologic Map of the Colona Quadrangle, Montrose and Ouray Counties, Colorado. The Survey, 1987.
Warning: These citations may not always be 100% accurate.