This subseries holds research files utilized by Philip E. Orbanes for his books The Monopoly Companion and Monopoly: The World’s Most Famous Game. Among these materials are correspondence with fellow “Monopoly” enthusiasts, photographs, news articles, copies of patents, copies of legal agreements, information on specific editions of “Monopoly” games, tournament narratives, eBay listings of rare games, information on predecessors to “Monopoly,” and more. Additionally, there are several files on the “Anti-Monopoly” trial that took place between Ralph Anspach and then-parent company of Parker Brothers, General Mills. This subseries has been further divided into four categories: Name/subject files; Variations of Monopoly; Publications; and Anti-Monopoly trial transcripts.