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Subject (Genre)
- Periodicals49
- Congresses42
- Bibliography28
- Statistics18
- Statistics, Vital16
- Sources8
- Electronic books5
- Conference papers and proceedings2
- Treaties2
- Abbreviations of titles1
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- Annual Reports1
- Biography1
- Catalogs1
- Curricula1
- Electronic journals1
- Executive Department Publications1
- Miniature books1
- Pamphlets1
- Specimens1