USGS

USGS (United States Geological Survey) has a lot of data that is available; some of it for free, some at a cost. Many people are familiar with the USGS Topo Maps, sometimes referred to as "Quad Maps", or "USGS Quad Maps".  You can go to the USGS Web site at http://www.usgs.gov/ and learn more about what they do and the information they have. Here is a sample of a USGS Quad Map:

This is an index to show where the quads are within Clinton County. (PDF map)

Parts of a 7 1/2 Minute Quad Map...and how Quad Maps are made up...

USGS Legend...