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Genre
- Government document2,005,231
- Conference proceedings484,640
- Technical report449,783
- photographs427,375
- Biography242,552
- Congresses216,577
- Periodicals199,396
- Early works to 1800197,824
- Maps138,728
- Books138,488
- History137,603
- Thesis/Dissertation136,148
- Fiction129,984
- Streaming audio83,000
- Exhibitions78,646
- Bibliography60,225
- Sources56,459
- Statistics53,694
- Scores53,262
- Catalogs48,571
