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Subject (Genre)
- Periodicals195
- Dictionaries64
- Congresses38
- Bibliography18
- Internet videos18
- Handbooks, manuals, etc13
- Abstracts12
- Periodical12
- Electronic books9
- Directories6
- Early works to 18006
- Encyclopedias6
- Formulae, receipts, prescriptions6
- Tables5
- Biography4
- Conference papers and proceedings3
- Exhibitions3
- Handbooks and manuals3
- Patents3
- Booksellers' advertisements2