The best account of the Goodnight-Loving drive is the book by J. Evetts Haley,
Charles Goodnight: Cowman and Plainsman.
Haley was able to talk to Goodnight in the 1920s and get his oral history. This is eye-witness stuff, unvarnished.
You can get a paperback on Amazon.
It contains all of Goodnight's life, including his ranch near Pueblo, CO and the JA Ranch near Amarillo, not just the Goodnight-Loving drive.
Another book I really like is Andy Adams,
Log of a Cowboy. It's not a true oral history, but recollections of Adams from his days on the trail.
The other is
We Pointed Them North by Teddy, E.C. "Blue" Abbott.
It may take a while for folks to get accustomed to how people talked back then, but all of the books give you a realistic picture of cowboy life.
As far as the Pecos River country, Patrick Dearen has written several good books on this area. One of them is
Crossing Rio Pecos. Another is
Castle Gap and the Pecos Frontier. Dearen also wrote
A Cowboy of the Pecos. Most are self-published, but they ARE available on the Internet. He details his books with diary entries and letters, so it's all well-sourced, and danged informative.
Castle Gap and the Pecos Frontier is available from TCU press, or at least it used to be.
Of course I have my book,
Texas Cowboy, too.
“If you have a job without aggravations, you don’t have a job.”
Malcolm Forbes