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Subject (Genre)
- Congresses508
- Periodicals282
- Handbooks, manuals, etc143
- Internet videos142
- Electronic books95
- Periodical94
- Educational films82
- Legislative hearings57
- Bibliography55
- Environmental impact statements49
- Documentary films35
- Case studies34
- Statistics33
- History30
- Handbooks29
- Handbooks and manuals27
- Programmed instruction23
- Dictionaries22
- Nonfiction films22
- Biography21