Has there ever been a thorough book written on the commerce of the Old West?

Patrick Wheaton Camby, IN I called James Denniston in Jackson, Wyoming, who specializes in books on the Old West, and he suggests The Plains Across by John Unruh; Entrepreneurs of the West by David Dary; and Commerce of the Prairies by Josiah Gregg. These are good, especially the Unruh book, which was written for his Ph.D thesis. He died at 39 and the book, published after his death by the University of Illinois Press in 1978, was considered for a Pulitzer in history. Also Bob Boze Bell’s Wyat