Research Databases: O

List of research database titles, descriptions and links
Visit Ohio History Central from Ohio History Connection
Ohio History Central Encyclopedia

An evolving, dynamic online encyclopedia that includes information about Ohio's natural history, prehistory and history. Each section contains written information, maps, timelines, and images.

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Oxford Research Encyclopedias
Oxford Research Encyclopedias

Authoritative reference content exploring topics in humanities, social sciences, and science. 

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