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Subject (Genre)
- Periodicals10,046
- Congresses8,255
- Statistics7,182
- Internet videos6,249
- Handbooks, manuals, etc3,451
- Data sets3,358
- Periodical3,131
- Legislative hearings2,745
- Educational films2,706
- Electronic books2,574
- Legislative Report - Public Bills2,404
- Biography2,169
- Bibliography1,886
- Nonfiction films1,855
- Case studies1,586
- Correspondence1,465
- Documentary films1,371
- Early works to 18001,283
- Executive Department Publications1,174
- Popular works1,137