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- Anderson, Orvil A.2
- Balloons.2
- Meteorology.2
- National Geographic Society (U.S.)[remove]2
- Stevens, A. W. (Albert William), 1886-1949.2
- Aeronautics--United States.1
- Bartol Research Foundation.1
- Camp sites, facilities, etc.1
- Scientific expeditions.1
- Scientific research.1
- Swann, W. F. G. (William Francis Gray), 1884-1962.1
- United States. Army.1