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Subject (Genre)
- Dictionaries339
- Encyclopedias156
- Early works to 1800131
- Early works to 1600107
- Bibliography102
- Congresses77
- Biography42
- Electronic books26
- Indexes25
- Juvenile literature24
- Criticism, interpretation, etc18
- History15
- Bio-bibliography13
- Annotations (Provenance)12
- Catalogs12
- Encyclopedias and dictionaries12
- Monographs12
- Sources12
- Executive Department Publications11
- Periodicals10