Folder A.5.1: Molecular Electronic Quantum Mechanics Conference, sponsored by University of Texas and National Science Foundation, held at Austin, Texas, 7-9 December 1955; and Coulson's visits in USA, 4-18 December 1955. Includes: conference programme, photograph, travel and financial arrangements, Coulson's notes, abstract of Coulson's paper, invitations to visit other universities (M.I.T., Universities of Minnesota, Wisconsin, Northwestern and Chicago) and related correspondence.

Folder A.5.2: Symposium of the Quantum Theory of Molecules, Stockholm and Uppsala, 21-25 March 1955. Includes: conference programme and abstracts of papers delivered, lists of participants, Coulson's notes, correspondence regarding Coulson's lectures in Oslo and Trondheim, and travel arrangements.

Folder A.5.3: Lectures in Belgium (sponsored by the British Council), 11-16 January 1954. Invitation and travel arrangements.

Folder A.5.4: Lectures in Madrid and Valladolid (sponsored by the British Council), 18-26 March 1953. Includes: Coulson's notes for, and typescript of, lectures; invitations to lecture; correspondence with British Council and Spanish Embassy; Coulson's report to the British Council on his visit.

Folder A.5.5: Visit to University of North Carolina to deliver the McNair Lectures, and to Haverford College as Philips Visitor, April 1954. Includes: invitation to give lectures, schedule of visits, printed matter regarding both universities, correspondence from sponsors and from members of audience at lecture, including exchange with Mrs. Ellen Knox regarding Einstein's views on the influence of a scientist's personality on his research. The McNair Lectures were published as Science and Christian Belief.

Folder A.5.6: International Conference on Theoretical Physics, Kyoto, 7-29 September 1953. Includes: extensive correspondence regarding pacifism and religion; invitations to lecture; Coulson's notes on Japanese scientific work.

Folder A.5.7: Conference on Quantum-Mechanical Methods in Valence Theory, Shelter Island, New York, 8-10 September 1951. Includes: conference programme and printed information; MS. and typescript of Coulson's contribution and his comments on other papers presented at the conference; offprints and publications; correspondence, including invitation (declined) to lecture at Harvard during visit to USA.

Folder A.5.8: Visit to Switzerland, April 1951. Schedule of visit, and lectures to be given at Zurich and Basle; brief correspondence with colleagues regarding organization of visit.

Lecture tour in Holland, 5-28 March 1949. Includes: travel arrangements and programme of lectures; extensive MS. notes and drafts for lectures on 'Methods of Molecular Orbitals', 'Methods of Atomic Orbitals', 'Hybridisation', 'Conjugated Compounds', 'Polarities and Strengths of Bonds', 'Colour', 'Future Developments', extended lecture on 'Benzene'. Also includes correspondence with colleagues regarding subjects and time-table of lectures, letters of thanks, etc.

Folder A.5.9: Symposium on Chemical Bonding, organized by Centre National de la Recherche Scientifique, Paris, 4-11, 12-18 April 1948. Includes: Correspondence with organiser E. Bauer regarding organization, and participants, and regarding subsequent visit to Paris by Coulson; with M. Haissinsky regarding publication of paper given by Coulson at symposium.