This collection consists of the Maps Series of The Great Lakes-Ohio Valley Ethnohistory Collection, 1953-1966, a unique assemblage of primary and secondary resources pertaining to the Native American occupancy of the region. These maps and other items were assembled to support the Great Lakes-Ohio Valley Ethnohistory Project. This U.S. Department of Justice funded research activity was responsible for the preparation of in-depth reports concerning American Indian land use and tenure. These reports were intended to be used in the government's defense against cases involving alleged treaty inequities and which were brought before the Indian Claims Commission, a body and a process authorized by federal legislation signed into law on August 13, 1946.