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  1. 1820 Historical Ohio Counties Map – shown on Google Maps

  2. Historical Maps of Ohio - Edmaps.com

  3. Old Historical City, County and State Maps of Ohio - MapGeeks

  4. Historic Maps & Atlases - Ohio History Connection

  5. Map Of The State Of Ohio. Drawn by A. Bourne. Including the …

  6. Map of Ohio - Library of Congress

  7. A map of the State of Ohio | Library of Congress

  8. Map of the State of Ohio - Library of Congress

  9. Map of the State of Ohio Drawn by A. Bourne. Including the …

  10. 1820 Ohio map (Bourne- Rumsey ) - University of Michigan