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The correspondents are:

Dr I Dorothea Raacke (includes photograph b/w 5" x 4" of Crick at Boston University), Professor B R Rabin, Dr Silvio Ranzi, Professor B A Rasmusen, Dr Matthew J Raszka, Mrs M S Rattue, Dr Minocher Reporter, Alexander Rich (Rosalind Franklin, poly A), Dr James F Riley, Ralph Riley, Professor Luis M Rinaldini, A J Roberts (tidal field theory), Dr D B Roberts, H R W Roberts, Dr Alan Robertson (Peter Walker), Dr Cortland O Robinson, Professor Steven Rose, Lord Rothschild, Dr H Jac. Rousseau, Dr Georg Rumer, Professor Yu. B Rumer, Professor John Runnstrøm (diffusion gradients), and Dr Charles L Rutherford (diffusion gradients).

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