F.11-F.15: 5th International Congress of Chemotherapy, Vienna, 26 June-1 July 1967. Abraham delivered a lecture 'Synthesis and Semisynthesis of Some Antibiotics'. Includes correspondence regarding arrangements and arising, a 16pp manuscript draft of the lecture, with corrections, and a 13pp corrected typescript version with manuscript annotations.

F.16-F.21: Visit to the USA, October 1967.Abraham delivered lectures at the annual meeting of the Infectious Diseases Society of America and at the Seventh Interscience Conference on Antimicrobial Agents and Chemotherapy, both in Chicago. A provisional title for Abraham's lecture at the Infectious Diseases Society of America is given as 'Penicillinases and Cephalosporinases'. At the Interscience Conference on Antimicrobial Agents and Chemotherapy, Abraham, with Guy Newton and S. Kuwabara, lectured on 'Preliminary observations on the formation and spontaneous breakdown of Cephalosporoic acids and their derivatives'. Includes correspondence regarding arrangements and arising and a printed booklet of abstracts of the papers presented at the conference.

F.22-F.25: Gregynog Natural Products Symposia, 1969-1975. The purpose of the symposia, held in Gregynog Hall, Wales, was to facilitate communication between research workers in industry and academic institutions. In 1971 the event was re-named 'European Symposium on Bio-Organic Chemistry'. Abraham participated in the 1973 and 1975 symposia. F.22-F.23: Abraham agreed to participate in the 1970 Symposium and partly prepared a lecture, but found he was unable to attend due to a mix-up in his diary. Includes a 35pp typescript draft of Abraham's intended lecture, 'Biosynthesis of Some Peptide Antibiotics'. F.24-F.25: European Symposium on Bio-Organic Chemistry Chemistry', 18-21 May 1973 and 16-19 May 1975. Includes correspondence regarding arrangements and arising, with programme etc.