Cole and Hitch's final ride
Unless someone finds a final transcript, this is the last installment in the series written by Robert B Parker. While some of the language is questionable as to whether it would have been used. It is none the less a very enjoyable adventure with picturesque scenes of the old west. If you are looking for short series of westerns this may be the book series for you.
Appaloosa, Resolution, Brimstone, and then Blue-Eyed Devil.