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Subject (Genre)
- Congresses7,494
- Early works to 18003,414
- Periodicals2,564
- Biography2,421
- History2,105
- Electronic books1,602
- Academic theses1,156
- Criticism, interpretation, etc1,066
- Interviews784
- Bibliography772
- Dictionaries731
- Early works490
- Internet videos431
- Introductions410
- Conference papers and proceedings396
- Miscellanea389
- Sources365
- Correspondence314
- Educational films312
- Case studies276