Catalog Choice

http://www.catalogchoice.org/

Catalog Choice is a free service that allows you to decide what gets
in your mailbox. You can reduce the number of unsolicited catalogs
that are mailed to your home and office

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WorldCat

http://www.worldcat.org/

WorldCat is the world's largest network of library content and
services. WorldCat libraries are dedicated to providing access to
their resources on the Web, where most people start their search for
information.
What am I searching?

WorldCat.org lets you search the collections of libraries in your
community and thousands more around the world. WorldCat grows every
day thanks to the efforts of librarians and other information
professionals.

[This text taken from the website] 
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