Worldcat.org is the public face of the largest combined (or â€œunionâ€) library catalog in the world. Library folks usually refer to it as OCLC (Online Computer Library Center). Currently OCLC/WorldCat catalogs over 1 billion items from over 60,000 libraries around the world. This blog is not affiliated with OCLC/Worldcat in any way. Itâ€™s just an outlet for one bookseller/librarian (me) to feature unusual, rare and interesting items that exist outside of WorldCatâ€™s vast reach.