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Subject (Genre)
- Legislative hearings135
- Case studies86
- Congresses78
- Biography71
- Sources50
- Electronic books45
- History43
- Periodicals41
- Interviews20
- Bibliography16
- Military history14
- Treaties14
- Television news programs10
- Forecasts8
- Personal narratives, American8
- Annotations (Provenance)6
- Databases5
- Documentary television programs5
- Educational films5
- Encyclopedias5