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Places
- Grand Canyon (Ariz.)3
- New Mexico.3
- Chicago (Ill.)2
- Detroit (Mich.)2
- Garden of the Gods (Colorado Springs, Colo.)2
- Hawaii.2
- New York (N.Y.)2
- Oregon.2
- Pompeii (Extinct city)2
- Washington (D.C.)2
- West (U.S.)2
- Yellowstone National Park.2
- Albany (N.Y.)1
- Alexandria (Va.)1
- Algiers (Algeria)1
- American Fork Canyon (Utah)1
- Arctic regions--Aerial exploration.1
- Arctic regions--Discovery and exploration.1
- Arizona.1
- Arlington (Va.)1