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This website has slip opinions, electronic versions of the United States Reports (volume 502 onward), and other useful information for Supreme Court cases. Authors of that site caution users that print versions are the official source. http://www.supremecourtus.gov
This website provides online access to Supreme Court decisions since May 1990 through Project Hermes. Site also has over 300 of the most important historical cases available online in a separate file. http://supct.law.cornell.edu/supct