These digital books are available at:
Allen County Public Library
Brigham Young University Harold B. Lee Library
Brigham Young University Hawaii Joseph F. Smith Library
LDS Church History Library
Family History Library
Houston Public Library - Clayton Library Center for Genealogical Research
Mid-Continent Public Library - Midwest Genealogy Center
I will say that most newcomers search only for names. In fact, I'll admit that I do the same on my first search on a new web site and I suspect a lot of other experienced genealogists do the same. However, after exhausting the search for names, most experienced genealogists start looking for other search terms. I always look for locations. Many times, I have been successful at finding some tidbit about an ancestor by searching for the county or the town in which he or she lived, even after a search for the person's name produced no results at all.
One of my more successful searches came from searching for the name of the small town in which my great-great-grandparents lived. I knew he was a farmer so I searched for his name plus the name of the small town in which they lived. I was rewarded with a scanned digital booklet of only 42 pages, printed in 1842, that listed all the farmers in the county, along with a detailed description of the farm and even the assessed value of the property. It listed the total acreage of their property, the number of acres under cultivation, the number of acres of woodlands, the number of barns and outbuildings, how many head of cattle, sheep, and swine that they owned, and even the number of chickens. It also listed the crops they sold. I learned a lot more about my great-great-grandparents in that small booklet than I ever found in census records!
When searching old books and other printed information, you have to be creative. You should search not only for locations, but also for fraternal organizations, religious affiliations, veterans' organizations, labor unions, and anything else you can think of.