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Subject (Genre)
- Periodicals23,790
- Congresses20,814
- Statistics16,932
- Electronic books6,282
- Early works to 18005,668
- History5,158
- Internet videos4,945
- Case studies4,792
- Bibliography3,651
- Sources3,540
- Legislative hearings3,518
- Biography3,267
- Data sets3,149
- Educational films1,800
- Documentary films1,723
- Maps1,661
- Academic theses1,423
- Handbooks, manuals, etc1,391
- Dictionaries1,267
- Television news programs1,168