As I searched through the World Cat resource, I was amazed at the amount of information there.  I will need to spend more time on this one to see all that it has to offer.
I searched the book "Shiloh" and of course found many results.  4048 libraries have copies of the book.    The top of the list was the South Dakota State Library.  I found the call number to be FIC.  We were just looking for some call numbers the other day as we were moving some books around in our library and trying to decide where they should be shelved.  This would be a good source for that.  I like the option to be able to see what else the author has written.  Also liked the ability to see what else is available on that subject.  I was impressed with the many ways to sort out what came up or to search by these many options also.  Books, Sound, Internet, Visual, Archival, Computer, Scores, Serials, Maps  - Lots of information provided in that one search.