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Subject (Genre)
- Congresses539
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- Periodicals101
- Internet videos99
- Documentary films81
- Congress61
- proceedings (reports)54
- Education films21
- Educational films19
- Documentary television programs15
- Science television programs14
- Handbooks, manuals, etc13
- Handbooks and manuals12
- Science films10
- History9
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- handbooks8
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- Handbook6