Cook Burr Cook 
Six Wagons to Laramie, a Western [EPUB ebook] 

This story is a fast moving western. A New York family named Hansom moves west by wagon train. The wagon master turns out to be a gunfighter who falls in love with Carla Hansom. They have many adventures along the way including an encounter with an outlaw sheriff known as Big Steve Long. This is the first of a saga of four stories. Second is "Bart of the Badlands". Third is "Lawmen of Laramie" and fourth is "Cowboy Cattle Call Songs".