Dalton Community Historical Society
Darke County Historical Society
Dawes Arboretum
Dayton Aviation Heritage National Historical Park
Dayton and Montgomery County Public Library
Defiance Public Library
Delphos Canal Commission
Denison University
Dittrick Medical History Center
Dominican Sisters, St. Mary of the Springs
Dover Historical Society
Dr. Samuel L. Bossard Memorial Library
Dublin Public Library and Dublin Historical Society
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