Academic Universe (Lexis/Nexis)
GPO FDsys Digital System
http://www.gpo.gov/fdsys/search/home.action
http://www.gpo.gov/fdsys/browse/collectiontab.action
www.loc.gov/
National Archives
www.archives.gov/
Supreme Court
www.supremecourtus.gov/
USA.gov: The U.S. Government's Official Web Search
FindLaw -- Decisions, 1893, v. 150-
http://www.findlaw.com/casecode/supreme.html
LII Hermes--Legal Information Institute (LII), Cornell Law School--since 1990
Selected Historic Decisions of the Supreme Court