Papers relating to Addison's business interests, 1947-1951, (fols. 1-175) papers, 1947-1951, relating to the Boreham Institute of Agricultural Engineering (previously known as the Henry Ford Institute of Agricultural Engineering) including Management Council minutes and correspondence with Lord Perry (see also MSS. Addison dep. c. 176, fols. 194-378; c. 242, fols. 47-184), and (fols. 176-293) correspondence with Sir Rupert Guinness discussing agriculture, including farming the Elveden Estate, West Suffolk, and the Forestry Commission, 1949-1951.