If you buy the book and read it, give us a report on what you thought of it...
I actually listened to the unabridged audio version of this book. I have a long commute from the Coal Creek ranch to a place where I can actually make a living. Audio books are the main way I keep my sanity (such as it is) during the drives. I've listened to many hundreds of books over the years. Last night I was using my phone to answer and kept the answer short. Today I'm actually at a computer.
The Texas Rangers: Wearing the Cinco Peso, by Mike Cox, is the first of a two volume history of the Rangers (
http://www.amazon.com/TEXAS-RANGERS-Wearing-1821-1900-Associates/dp/0312873867). This volume covers 1821-1900. I haven't read or listened to the second volume about the modern Rangers. The author is a former media relations/public information officer for the Rangers and had access to old records (
http://www.mikecoxonline.com/index.htm).
I thought the book was very well done. It told the history without bogging down in statistics or minutia. While those things are important for history, I was interested in the stories of the people and this book focused on those stories.
I have also read (actually "read" on actual paper!) Robert Utley's
Lone Star Justice: The First Century of the Texas Rangers (
http://www.amazon.com/dp/0425190129). It has been too long since I read it to remember details, but I do recall enjoying it. Utley, of course, is a well respected historian and writer. I have read a number of his books.
There are also a number of first-person accounts of the Rangers. I own and have read
A Texas Ranger by N. A. Jennings, who served under Captain McNelly. A couple of years ago I also downloaded PDF versions of a number of books that are long out of print, but I can't find the source this morning. I think they came from a Texas Ranger museum in Texas, but I can't find the link. They are probably out there somewhere. The early accounts suffer from the problems typical of older first-person accounts and autobiographies in that they often show a strong bias and sometimes may stretch the truth a bit.
Those would be my recommendations, in that order.
CC Griff