Timothy H. O'Sullivan, 1871-1874 (survey), 1874 (expedition), 35. Beaver Lake, Conejos Canon, Colorado, 9,000 feet above sea-level, and 30 miles from mouth of Canon., [Wheeler Survey, Explorations and Surveys West of the 100th Meridian], Stereocard, detail, Etherton Gallery, LL/24777
Timothy H. O'Sullivan 1871-1874 (survey), 1874 (expedition) 35. Beaver Lake, Conejos Canon, Colorado, 9,000 feet above sea-level, and 30 miles from mouth of Canon. [Wheeler Survey, Explorations and Surveys West of the 100th Meridian]
