- Black Canyon of the Gunnison River
| Hansen, Wallace R. (1971), Geologic map of the Black Canyon of the Gunnison River and vicinity, western Colorado: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1-584, scale 1:31,680. Hansen, Wallace R. (1965), Black Canyon of the Gunnison: Today and Yesterday. USGS Bulletin 1191, 76 p. |