A thousand miles of mustangin'
by Ben K. Green
Was a great read. First read it as a kid 30 years or more ago, have read it several more times since. Some of the areas described I could figure out. Its interesting as he trails across Texas and Mexico.
Heres a link.
http://www.alibris.com/search/books/qwork/6680354/used/A%20thousand%20miles%20of%20mustangin'