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| Information requests | |
| 1 | Improving content on US states |
| Introduction | |
| 2 | Introduction to photography in Colorado |
| Photographers | |
| 3 | Timothy O'Sullivan: Explorations and Surveys West of the 100th Meridian (1871-1874) |
| 4 | William Bell: U.S. War Dept., Corps of Engineers; Geographical Explorations and Surveys West of 100th Meridian, Expedition of 1872; Lieut. Geo. M. Wheeler, commanding. / Colorado River Series [Stereoviews] |
| 5 | Duhem & Bro.: Beauties of the Rocky Mountains. (1869-1879) [Series] |
| Significant locations | |
| 6 | Colorado: Mountain of the Holy Cross |
| 7 | Colorado: Garden of the Gods |
| 8 | Bone Field on Talbot Hill, 10 miles from Canon City, Colo. |
| 9 | A Rephotographic Survey of the American West: Mountain of the Holy Cross |
