Just tried books.google.com and put in an ancestor's name from my Vernon genealogy "Ephraim Green" and found several books where my ancestor is mentioned. Now I'm going to try to get one book by inter-library loan that I haven't seen before: Over the Rim: the Parley P. Pratt's Exploring Expedition to Southern Utah, 1849-1850 written by Wm. B. Smith, published by Utah State University in 1999. It's available at a local University library in Cedar City, Utah nearby.
When you put in a name or word to search in all its books, it brings up the actual sentence where that word/s are found on a page from different books they have digitized in the google collection. In some cases out of print books not copyrighted, they will have the actual book there for you to read or where to buy it or get it from a library. It's an amazing world we live in. Try it, it's an exciting site.