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Subject
- National Geographic Society (U.S.)[remove]4
- Balloons.3
- Stevens, A. W. (Albert William), 1886-1949.3
- Anderson, Orvil A.2
- Meteorology.2
- Aeronautics--United States.1
- Aeronautics.1
- Award presentations.1
- Awards.1
- Ballooning.1
- Bartol Research Foundation.1
- Camp sites, facilities, etc.1
- Coolidge, Calvin, 1872-1933.1
- Coolidge, Grace Goodhue, 1879-1957.1
- Lindbergh, Charles A. (Charles Augustus), 1902-1974.1
- Lindbergh, Evangeline Lodge Land.1
- Scientific expeditions.1
- Scientific research.1
- Swann, W. F. G. (William Francis Gray), 1884-1962.1
- United States. Air Force.1