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Places
- Chicago (Ill.)4
- Garden of the Gods (Colorado Springs, Colo.)3
- San Francisco (Calif.)3
- Colorado Springs (Colo.)2
- Grand Canyon (Ariz.)2
- Hawaii.2
- Michigan.2
- Monterey (Calif.)2
- Niagara Falls (N.Y. and Ont.)2
- Philadelphia (Pa.)2
- Riverside (Calif.)2
- Washington (D.C.)2
- West (U.S.)2
- Yellowstone National Park.2
- Andes Region.1
- Arctic regions--Aerial exploration.1
- Arctic regions--Discovery and exploration.1
- Arizona.1
- Atlantic City (N.J.)1
- Aurora (Mo.)1