E.23-E.25: 'ONR' Lecture (banquet speech) by Abraham at the Annual Meeting of the Society for Industrial Microbiology, Northwestern University, Evanston, Illinois, USA, 19-24 August 1973. The title of the speech was 'Some Aspects of the Development of the Penicillins and Cephalosporins'. E.23 contains correspondence regarding arrangements and arising, May-February 1974. E.24 contains a 29pp typescript draft of the lecture with manuscript revisions and a 22pp copy of the typescript of the…