WorldCat.org, Google Books and more...

WorldCat.org is a major international connection to over 10,000
libraries worldwide and catalogs over 1.5 billion items. Google Books
contains over 10,000,000 digitized books and magazines. WorldCat.org
and Google Books are now interlinked. If you search for a book on
Google Books and find the item, one of the options is to find the item
in a library. Clicking on this option gives you a link to WorldCat.org.
The WorldCat search for the item gives you the full citation, a
reference to every edition of the item and by entering your zip code, a
list of libraries that have the item, including the distance from your
own location. Quoting from the OCLC
Website:
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