Litigator's Internet Resource Guide: Rules of Court - One stop collection of links to federal, state, and local court rules; extensive coverage for all states includes both state rules and state local rules. United States Patent and Trademark Office - Patent related reference materials include applicable statutes, regulations, issued patents and applications, and prosecution histories. American Law Sources On-line (ALSO) - Links to free on-line sources of American law that are available without charge, with some additional links to Mexican and Canadian resources. Wash-Law Web - Links to Federal Government internet resources and other government related material, from Washlaw (Washburn University School of Law). Legal Information Institute - State Law by Source - Internet-accessible sources of constitutions, statutes, judicial opinions, and regulations, for all fifty states, Washington DC, and the U.S. territories. Legalbitstream - Searchable databases of federal tax law. PLoL - Free database of state and federal case law, with links to additional resources. CourtReference - Information about trial courts in each state including an overview of the types of cases handled by each court.