Overview: This collection includes materials relating chiefly to Thayer's writing and teaching career. Includes research notes and drafts for A Preliminary Treatise on the Law of Evidence at the Common Law (1898) and his biography of John Marshall (1901); papers relating to his participation in the writing of the constitutions of North and South Dakota, 1889, and his chairmanship of a committee concerned with Indian legislation, 1887-1892; diary-like letters to his wife, Sophia Bradford (Ripley)...