The correspondents are:
File 1: Dr Johannes H P Hackstein, Richard Hahnloser, Dr Nigel D Haig, Lee Halperin, Mrs Betty Hansen, Arlo D Harris, Dr John Harrison, Mr J P Hart, Dr Erich Harth, Dr Renee Harwick, Dr Michael G Fisher (Executive Editor for Science and Medicine, Harvard University Press), Mr D R Hatter, Martin Meyerson on Lita Annenberg Hazen, John E Hearst, Robert Hecht-Nielsen, Steve Heinemann, and Jeff Heisley.
File 2: Dr Roger Highfield (Science Editor, The Daily Telegraph), Hilton Foundation, Dr Harry Hixson, Dr Mahlon Hoagland, Allan Hobson, Dr Don Hoffman, William C Hoffman, John P Hollis, Frank L Holloway, John R Holt, John Hopfield, Arthur Hopmans, Dr Norman Horowitz, Dr Jonathan C Horton, Patrick K House, Mr Charles L Howe, Dr David H Hubel, Dr Keith Humphrey, John Humphreys (Hallowed Turf), Anya C Hurlbert, Mr Peter A Hunt, Dr Laurence D Hurst, and Dr Walter Gilbert.
A letter detailing sensitive personal circumstances has been extracted to files PP/CRI/J/1/4/22.