Folder B.39.1: 'A comparison of the various representations of ethylene', 1955-1959. MS. notes, typescript draft. Correspondence with C. Moser and F. Birss. Folder B.39.2: 'Hydrogen bond ideas', 1956-1972. Numerous sets of notes and data assembled by Coulson over the years. Many are paginated, few are dated. Typescript 'The hydrogen bond', based on a lecture before the Basler Chemische Gesellschaft, February 1963. Correspondence with W.N. Lipscomb, January 1957, regarding neutron…