Then check this out at LibraryThing. It lists what was on the bookshelves of such famous personages as Sylvia Plath, F. Scott Fitzgerald, Marie Antoinette and many others, going off lists of books sold at auction and other sources. You can get a glimpse into which books they enjoyed, which they cared enough about to keep on their shelves.
A fascinating thing, no? Check back there often as there are several "libraries in progress" as the editors work on adding information to their lists.