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Subject (Genre)
- Periodicals6,381
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- Statistics4,513
- Case studies3,411
- Congresses3,227
- Electronic books1,216
- Directories1,184
- History869
- Handbooks, manuals, etc820
- Documentary films434
- Interviews429
- Nonfiction films373
- Sources370
- Bibliography257
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- Biographies236
- Streaming videos205
- Pictorial works202
- Longitudinal studies198
- Feature films174