The correspondents are:
Professor Piergiorgio Odifreddi, Dr Robert Olby, Willard W Olson, John Woolf (relating to the Order of Merit), Robert K J Killheffer (OMNI Magazine), Dr R N Ondarza-Vidaurreta, Steve Oppenheimer, Dr Ioan Opris, Todd M Owen, Dr Clyde W Oyster, Carl Pacifico, Professor Günther Palm, Helen Pang, Dr Thomas V Papathomas, L Paolantonia, Linus Pauling (1925-), Linus Pauling (1901-1994), Andrea Von Troschke (relating to Linus Pauling), Angelika Berger (relating to Linus Pauling), Professor Roger Penrose, Professor Richard L Landau (Perspectives in Biology and Medicine), Dr Max F Perutz, Iacob Petrescu, Professor John D Pettigrew, [Laura Ann] Petitto and Kevin Dunbar, Sir David Phillips, Joseph Phillips, Dr Laurence O Pilgeram, Dr Laurence O Pilgeram, Dr Adrian Pini, Benjamin Pinkel, Melicca McCormick (Plenum Publishing Corporation), Proceedings of the National Academy of the Sciences (PNAS), Dr Tomaso Poggio, James W Pohl, Dr Chi-Sang Poon, Dr David D Potter, Peter Pring, Dr Vladimir I Prozorovski, Stanley B Prusiner, Dr Dale Purves, and Klaus-Peter Pzillas.
A letter detailing sensitive personal circumstances has been extracted to file PP/CRI/J/1/3/21.