Railway postal diagram of the state of Ohio prepared for the use of the Railway Mail Service by W. L. Nicholson, Topographer of the Post Office Dept.

Map shows county boundaries, cities and towns, and the railroad network with names of lines along the railroads.
Description derived from published bibliography.
Scale ca. 1:600,000.
LC Railroad maps, 283
"The railroads and post offices are shown as at the date of June 15th 1882."
Available also through the Library of Congress Web site as a raster image.