Hodgkin was invited by W.N. Lipscomb to the Congress to give a paper on protein structure, subsequently to be combined with a visit to Lipscomb's own department at the University of Minnesota. Visa problems, however, prevented her from visiting the USA at this time. See also MS. Eng. c. 5705/9. Later that year arrangements were made for Hodgkin to visit the USA and in December she visited the University of Minnesota, University of California Los Angeles and the California Institute of Technology (Linus Pauling).

Correspondence re arrangements. June-Nov. 1956, July-Dec. 1957.