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U.S. Copyright Office
Works registered and documents recorded by the U.S. Copyright Office since January 1, 1978.
Copyright Records: Free Texts
Catalog of Copyright Entries, 1906-1978
Catalog of Title Entries of Books Etc., 1891-1905
Copyright Law of the United States
The complete text of Title 17 of the U.S. Code, covering copyright and related laws, including those that describe "fair use".
Copyright Clearance Center
At copyright.com you can search for and obtain permission to use and share content from the world's leading titles in science, technology, medicine, humanities, news, business, finance and more