- The Encyclopedia of Cleveland History
- The definitive source of information regarding the history of Cleveland, Ohio.
- Presents stories with related content in the form of videos, audio clips, documents and images. Covers information about films, famous trials, disasters, history and biography. Common Core, State and 21st-Century research-and-learning standards.
- Military History Encyclopedia
- Reference for all military history - wars, individuals, battles, weapons and the concepts behind warfare.
- ORB: The Online Reference Book for Medieval Studies
- Includes several items from the Medieval period.