Passage to Dodge City was published by Signet in September 1972. Starbuck is on another cattle drive but this one is fraught by peril from a mysterious bushwhacker along with the terrain. #10 in the Starbuck series by Ray Hogan.
Allan Kass shows our hero as he chases after the bad guys. We don't get a good look at his face, but he looks like a force to be reckoned with. Note Allan's signature just below the horse's nose.