We used to get all of ours from USCGS (United States Coast & Geodetic Survey) 1/4 MOA maps. 'Course you gotta have a 3' plotter to get the full effect of the document. Might look for aerial overlays in your area, or call a local surveyor and see if they know anything. I bet they now have discs of every area so you can plot out small sections of the topo as needed. I retired from surveying before that came out, though...
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