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Subject (Genre)
- Periodicals2,078
- Internet videos1,387
- Educational films896
- Nonfiction films517
- Data sets516
- Maps516
- Physical maps339
- Instructional films290
- Periodical273
- Streaming videos270
- Lectures266
- Documentary films154
- Maps, Physical78
- Congresses76
- Alexander Street Video73
- Instructional television programs70
- Documentary television programs69
- Filmed lectures62
- Short films54
- Film clips41