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- Aeronautics--United States.1
- Anderson, Orvil A.2
- Astronomy.1
- Balloons, Sounding.2
- Balloons.2
- Bartol Research Foundation.1
- Camp sites, facilities, etc.1
- Compton, Arthur Holly, 1892-1962.1
- Gondolas.1
- Meteorology.[remove]5
- National Geographic Society (U.S.)2
- Piccard, Jean Felix, 1884-1963.1
- Scientific expeditions.1
- Scientific research.1
- Stevens, A. W. (Albert William), 1886-1949.2
- Stratosphere.2
- Swann, W. F. G. (William Francis Gray), 1884-1962.1
- United States. Army.1
- Vietnam War, 1961-1975.1