There are 3 books in the Weird West Tale series. The newest book is The Doctor And The Dinosaurs which came out in 2013.

1
The Buntline Special

Book cover of The Buntline Special
Welcome to a West like you've never seen before, where electric lights shine down on the streets of Tombstone, while horseless stagecoaches carry passengers to and fro, and where death is no obstacle to The Thing That Was Once Johnny Ringo. Think you know the story of the O.K. Corral?…
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2
The Doctor And The Rough Rider

Book cover of The Doctor And The Rough Rider
It’s August 19, 1884. The consumptive Doc Holliday is preparing to await his end in a sanitarium in Leadville, Colorado, when the medicine man Geronimo enlists him on a mission. The time the great chief has predicted has come, the one white man with whom he’s willing to treat has…

3
The Doctor And The Dinosaurs

Book cover of The Doctor And The Dinosaurs
Welcome to a Steampunk wild west starring Doc Holliday, with zombies, dinosaurs, robots, and cowboys. The time is April, 1885. Doc Holliday lies in bed in a sanitarium in Leadville, Colorado, expecting never to leave his room again. But the medicine man and great chief Geronimo needs him for one…