The Ronald Dworkin Papers are open at Yale University. They "document Dworkin’s life and career as a law professor,
author, and legal philosopher. Materials primarily document his
professional career and activities, including his work as a professor at
Yale University, Oxford University, and New York University, as well as
his academic writing, focused on legal and political philosophy, and
his popular writing on contemporary politics and the U.S. Supreme Court." Pdf of the inventory is here. H/t Scott Shapiro.
--Dan Ernst