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There are two sources for locating case law. Both cover some state appellate and supreme court cases. They also cover federal court cases. Lower court cases often need to be found at the individual court website.
Nexis Uni features news, business and legal sources from LexisNexis, including U.S. Supreme Court decisions dating back to 1790, with an intuitive interface that offers quick discovery across all content types.
Hein Online provides access to a vast PDF collection of legal research materials, including law journals (many of which date back to the 1800s) and a wide range of primary sources on the history of Anglo-American law.