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| Caesar's Creek Pioneer Village | Waynesville |
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| Camp Dennison | Cincinnati |
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| Camp Sherman, Inc. | Chillicothe |
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| Camp Tuscazoar Foundation Inc | Zoarville |
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| Campbell Historical Society | Campbell |
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| Campus Martius/Ohio River Museum | Marietta |
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| Canal Fulton Historic Preservation Commission | Canal Fulton |
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| Canal Society of Ohio | Cincinnati |
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| Canal Winchester Area Historical Society | Canal Winchester |
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| Canfield Fairground Western Reserve Village | Canfield |
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