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- Encyclopedia of Alabama
- Encyclopedia of Chicago
- Encyclopedia of Cleveland History
- Colorado Encyclopedia
- Connecticut History
- Encyclopedia of Detroit
- Encyclopedia of the Great Plains
- Encyclopedia of Greater Philadelphia
- Encyclopedia of Oklahoma History & Culture
- Encyclopedia Virginia
- Guampedia
- Handbook of Texas Online
- HistoryLink.org: The Online Encyclopedia of Washington State History
- Kansaspedia
- KnowLA: Encyclopedia of Louisiana History, Culture and Community
- Laptop Encyclopedia of Connecticut History
- Maine: An Encyclopedia
- Encyclopedia of Milwaukee
- Encyclopedia of Minnesota
- Mississippi Encyclopedia
- New Georgia Encyclopedia
- Nebraska Studies
- NCpedia
- Ohio History Central
- Online Nevada Encyclopedia
- Oregon Encyclopedia
- Pennsylvania History
- Puerto Rico Encyclopedia
- South Carolina Encyclopedia
- Tennessee Encyclopedia of History and Culture
- The Canadian Encyclopedia
- Think Florida
- Utah History Encyclopedia
- West Virginia Encyclopedia
- WyoHistory.org