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This letter referred to the William T. Sedgwick Memorial Lecture, which Crick delivered at the Massachusetts Institute of Technology on January 22, 1965, with the title "The General Nature of the Genetic Code."
Original Repository:
The Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers
Original Repository. Wellcome Library for the History and Understanding of Medicine. Francis Harry Compton Crick Papers. 11646. URL. http://archives.wellcome.ac.uk/