Prime meridian: Washington, D.C.; Includes illustrated border.; "Entered according to Act of Congress in the year 1848 by Ensign's and Thayer ..."; Includes county divisions for Ohio, Indiana, Illinois, Missouri, Michigan, and parts of Wisconsin and Iowa.; "Drawn and engraved by J.M. Atwood, N. York." 71 x 89 centimeters Scale 1:63,360 City Maps
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