Martin Hollich, from the Harvard Law School Library, has produced a useful guide to Multi-State Legal Research. It lists materials by format (Internet, LexisNexis and Westlaw, and Print Resources) and also provides links to compilations of state laws on selected  topics, such as capital punishment, employment law, legislative histories, and taxation.

Several of the print resources that Hollich includes in his guide are available at the Heafey Law Library. An author and/or title search in OSCAR search will provide you with the call number and location.