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Subject (Genre)
- Congresses5,843
- Biography4,643
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- Bibliography2,613
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- Maps2,305
- Electronic books1,978
- Fiction1,934
- Sources1,930
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- Executive Department Publications1,250
- Records (Documents)1,208
- Treaties1,086
- Catalogs1,080
- Songs and music1,075
- Exhibitions966
- Poetry960