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Subject (Genre)
- Electronic texts52
- Periodicals34
- Internet resource20
- Advertising cards11
- Electronic books11
- Handbooks, manuals, etc8
- methods8
- Legislative hearings6
- Congresses5
- Handbooks and manuals5
- Instructional films5
- Case studies4
- Periodical4
- Statistics4
- Conference papers and proceedings3
- Bibliographies2
- Catalogs2
- Documentary films2
- Field guides2
- Internet videos2