But nothing starts a surprisingly heated debate in Grand Junction faster than one little space. Grand Junction Says Another. The Book Cliffs stretch from western Colorado into eastern Utah, and geologists have been calling them that for well over a century. Somewhere along the way, Grand Junction collectively looked at two perfectly good words and decided one was easier. If you're talking about streets, schools, businesses, or the way most people in Grand Junction write it in everyday life, you'll probably see Bookcliff as one word.