(CO. - Black Canyon) Black Canyon Of The Gunnison National Monument, U.S.G.S., Surveyed 1934(1950) A rare workiniteration of this sheet for Black Canyon that is labeled as an "Advanced sheet Subject to Correction". Brown ink illustrates the contours of the terrain and drainages, with some black ink identifying the place names and cultural features. Condition is very good. Image size is approximately 20 x 26 (inches).
