The correspondents are:
Dr David Harker (1953), Dr R A Hickling, Sir Harold P Himsworth (permission for Olby "to see the report prepared for the Biophysics Committee to assist him with the historical account he is preparing..."), Professor Mahlon Hoagland, Dorothy Hodgkin, Dr Robert W Holley, Dr R Holliday, Christopher Holme (BBC, "The Life Code"), Dr K Holmes (Paradies), Dr Norman J Holter, T A Hood (Central Office of Information, the counter current distribution machine), Dr David H Hubel, J H Humphrey, Dr John A Hunt, Dr Ing. Fritz Haas, Dr Lowell P Hager, Dr J B S Haldane, Dr James Hall (Polanyi), Dr L D Hamilton (The Double Helix), Dr Edda Hanington, Dr C Hansch (Pomona monograph), Miss Barabara Hanson, Miss Donna Haraway, [ ] Harris, Professor Henry Harris (Ken Burton), C M H Harrisson, W. Harrison (Leeds University), Dr Philip E Hartman, Dr Robert Haselkorn (The Bulletin of the Atomic Scientists, ochre suppressors), Dr K A Hassall, Professor Felix Haurowitz, R S Haworth (Crick family tree enquiry), Professor W Hayes, and [ ] Huxley.