It started with a story we published on the website about the Little Book Cliff Railway. Wikipedia defines the Book Cliffs (two words) asA series of desert mountains and cliffs in western Colorado and eastern Utah, in the western United States. Then, there's the Little Book Cliffs Wild Horse Area. The Use of Book Cliff from 1800 to 2008Google Colorado Book Cliffs: One Word or Two? The Use of Bookcliff from 1800 to 2008Google Colorado Book Cliffs: One Word or Two?