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Genre
- Electronic books770,681
- Legislative materials95,236
- Internet videos73,822
- Legislative hearings70,359
- Streaming audio65,011
- Interviews53,747
- Oral histories53,203
- Scores38,278
- Periodicals33,683
- Conference papers and proceedings24,546
- Newspapers21,740
- Documentary films21,189
- Electronic newspapers20,039
- Electronic journals16,107
- Business correspondence15,305
- Instructional films15,010
- Bibliographies11,704
- Broadsides11,613
- Audiobooks11,199
- Periodical10,901