Depends on what you are looking for, but you might try getting one of these, Texas atlas & gazetteer
. I can't vouch for the Texas one, but the Kansas one has several out of the way roads and unmaintained roads. A word of caution, some of the sites listed in the Kansas one are on private property and not open to the public. Also, if you search the web, you might find it cheaper on another site. I just posted that so you would know what I was talking about. I also found this site, http://www.dirtopia.com/wiki/Main_Page
. Not sure how accurate it is, since I haven't had a chance to really look at it.