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Subject (Genre)
- Periodicals27
- Lectures17
- Nonfiction films17
- Streaming videos15
- Handbooks, manuals, etc9
- Statistics9
- Popular works7
- Educational films6
- Periodical6
- Legislative hearings5
- Advertising cards4
- Congresses4
- Popular Works4
- Bibliography3
- Encyclopedias3
- Handbooks3
- Rules and practice3
- Advertisements2
- Catalogs2
- Conference papers and proceedings2