University of Texas at Austin
Ut Library: Perry Castaneda Maps of Ohio
A collection of state, city and historical maps of Ohio. Also includes maps of national parks and monuments in the state.
Ohio History Central
Ohio History Central: Shaping the Land
This site contains maps and other information about the Ohio's topography. Great details about how glaciers played a key role in the formation of Ohio's land, the natural resources left behind, and the natural regions and their differences.