Sorry but I donít update this page the way I should but below are some links to various states.† Also here are some handy links for all the USA:
∑ Google Maps with USGS Topographic maps overlay It also provides a link where the geo-enabled PDFs of each quad can be downloaded from the USGS
∑ Earth Explorer by USGS (great for finding† historical aerials)
∑ USDA GIS Ė Lot of free data including county wide topo and aerials
I also have links about programs / software to view these files and GPS links, and GPS programs. To view the links for a state click on the state name below. Also check Misc GIS Links for various links for all of the USA.
If you are looking for a GREAT program to work with GIS data and to make professional maps take a look at GIS Manifold. Also there is a great user group you can get help from. Also Cornell University has prepared a 124 page document comparing Manifold System 6.00 to ESRI's ArcGIS 8 and how to do several common task Right Click Here and select "Save Target as" Keep in mind this file is over 4 MBs.
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Since Sept. 16, 2002
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Keywords: DRGs, topographic maps, DOQQs, aerial photographs, and other GIS links for the USA