if you go to the Delorme website, pick their TopoUSA software 9.0, and use the code 9951 at checkout, you can get the software for $55 (regularly $99)!! http://shop.delorme.com/OA_HTML/DELibeCCtpSctDspRte.jsp?section=10742&minisite=10020 If you have used it or seen it, it's a darn good deal. Just passing it along.....this is good for TODAY ONLY.
I am going to see if the wife wants to buy this. She is a registered "Landman" in the oil and gas industry and is looking to dabble in GIS.
Landmen in this area have earned a healthy reputation for obfuscation. The gasicane brought in some that didn't operate ethically. Possibly the gascos didn't give them proper information. I threw one out of my yard that gave me info that was already known to be false. His replacement was much more truthful.
I would think the best place to find stuff like that would be with spelunker groups. http://www.forums.caves.org