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Subject (Genre)
- Periodicals78
- Internet videos57
- Congresses47
- Conference papers and proceedings16
- Bibliography12
- Charts, diagrams, etc10
- Annual Reports9
- Documentary television programs9
- Legislative Report - Public Bills8
- Nature television programs8
- Science television programs8
- Educational films7
- Maps7
- Monographs7
- Indexes6
- Executive Department Publications5
- Presidential Communications and Messages5
- Names Lists4
- Observations4
- Abstracts3