This post has little to do with Ohio County, but the following links will lead you to 11 different map collections - some of which might help you with your family tree research.
Norman B. Leventhal Map Center at the Boston Public Library
The Boston Atlas
The Harvard Map Collection
The Yale Map Collection
Historic USGS maps of New England and New York on the
University of New Hampshire Library website
New York Public Library Digital Gallery maps
David Rumsey Map Collection
Library of Congress Map Collections
Perry-Castañeda Library Map Collection at the University of
Texas
Historic Atlas of Canada Online Learning Project
Historic Cities
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