Types
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- Articles20
- Archives and Primary Sources17
- Bibliography and Citation Tools13
- General and Multi-disciplinary Resources13
- Full-Text Resources11
- Indexes and Tables of Content9
- Books, Ebooks, and Book Reviews8
- Digital Collections and Repositories8
- Historical Newspapers7
- Multimedia6
- Dictionaries4
- Quick Facts and Reference4
- Conference Papers and Proceedings3
- Encyclopedias3
- Historical Books3
- Historical Images3
- Search Engines and Web Sites3
- Standards and Technical Reports3
- Statistics and Datasets3
- Tutorials3