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Genre
- Government document2,005,191
- Conference proceedings484,610
- Technical report449,782
- photographs427,375
- Biography242,485
- Congresses216,560
- Periodicals199,375
- Early works to 1800197,814
- Maps138,711
- Books138,488
- History137,463
- Thesis/Dissertation136,141
- Fiction129,932
- Streaming audio83,000
- Exhibitions78,627
- Bibliography60,225
- Sources56,442
- Statistics53,688
- Scores53,194
- Catalogs48,564
