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Subject (Genre)
- Periodicals584
- Congresses557
- Conference papers and proceedings549
- Congress367
- Periodical367
- History314
- Internet videos285
- proceedings (reports)276
- Early works204
- Electronic books121
- Manuscripts118
- Dictionaries99
- Biography86
- Oil paintings80
- Handbooks and manuals70
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- Bibliography66
- Prescriptions, formulae, receipts, etc65
- Posters55
- Academic theses52