Eighty-four letter books covering the professional career of James William Hook, who was president and treasurer of Geometric Tool Company of New Haven, 1923-1944; member of President Hoover's National Organization on Unemployment Relief, 1931-1933; president of the New England Council; and president and director of United Illuminating Company, 1939-1942. There are letterbooks labeled general, Geometric Tool Company, National Association of Manufacturers, New England Council, unemployment activities, University of Connecticut, and United Illuminating Company. The collection also includes press clippings and genealogical information.