While our two books cover the same core topics of Rollins Pass and the Moffat Tunnel, the 2022 book is not a republication of our 2018 work—in fact, there's very little that's duplicated between the two books. Our 2022 book discusses completely new details and information about Rollins Pass that transpired in the four years between publications. The 2022 work has never-before-published and extraordinarily rare imagery meticulously restored from the originals: all historic photographs are printed in black and white with modern counterparts in full color. While our first book involved two dozen people, our second book involved the efforts of more than six dozen experts to help tell this area's vast story.