Fort Ancient : the great prehistoric earthwork of Warren County, Ohio / compiled from a careful survey, with an account of its mounds and graves, a topographical map, thirty-five full-page phototypes, and surveying notes in full, by Warren K. Moorehead.

Licence: Public Domain Mark

Credit: Fort Ancient : the great prehistoric earthwork of Warren County, Ohio / compiled from a careful survey, with an account of its mounds and graves, a topographical map, thirty-five full-page phototypes, and surveying notes in full, by Warren K. Moorehead. Source: Wellcome Collection.