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Subject (Genre)
- Internet videos2,724
- Congresses2,261
- Periodicals1,970
- Electronic books1,753
- Educational films1,733
- Sound recordings1,075
- Conference papers and proceedings1,062
- Data sets1,017
- Nonfiction films983
- Early works to 1800661
- Documentary films545
- Instructional films535
- Streaming videos499
- Periodical421
- Handbooks, manuals, etc402
- Lectures367
- Biography269
- History268
- Handbooks and manuals230
- Excerpts211