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| Ada Public Library-Historic Preservation | Ada |
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| Adams County Genealogical Society | West Union |
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| Adams County Historical Society | West Union |
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| Adena State Memorial-OHS | Chillicothe |
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| African American Archives & Auxilary | Cleveland |
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| African American Historical & Education Center at Columbus | Columbus |
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| African American Museum | Cleveland |
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| Akron-Summit County Public Library | *** |
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| Akron/Canton/Youngstown Railroad Historical Society | Sharon Center |
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| Alexandria Museum | Alexandria |
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