Last month, OCLC published a great list based on our own original research: The Library 100—Top Novels of All Time. It’s a list of the novels that more libraries have on their shelves than any others.
The research was based on holdings information in WorldCat, which lets you search the collections of thousands of libraries around the world. The hard part of the research wasn’t counting the libraries that had a copy … it was “clustering” lots of variations, editions, and translations of books. That way, a 1964 French translation of Pride and Prejudice counts the same as an English version from 2006. The important part isn’t the specific edition or version—it’s the fact that this is a novel that thousands of libraries have decided to keep in their collections.