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Subject
- History8
- Airplanes, Military2
- Anarchism2
- Atomic bomb2
- Deportation2
- Domestic terrorism2
- Hoover, J. Edgar (John Edgar), 1895-19722
- Inventors2
- Loomis, Alfred L. (Alfred Lee), 1887-19752
- Physicists2
- Politics and government2
- Radar2
- Radar equipment2
- Radar in aeronautics2
- Radicalism2
- Research2
- Science2
- Terrorism2
- United States. Federal Bureau of Investigation2
- World War (1939-1945)2