The correspondents are:
Dr A Leth Bak, Curtis L Baker, Dr R Balasubramanian (includes Balasubramanian, "Origin of life at molecular level," as typescript with four photographic Figures), Marcello Barbieri, Dr Jonathan Bard, Professor Horace B Barlow (proposing Gerald Westheimer for the Royal Society), Sid Barnett, Professor Richard H T Bates, Bell Laboratories, Dr H D Benington, Dr Kurt Benirschke, Dr Seymour Benzer, Professor Paul Berg, G Berzins, Dr Ken Biegeleisen, Biochemistry, Professor Colin Blakemore, Dr R M Blumenthal, Dr Joseph E Bogen, Dr I H J Bourne, Dr Paul D Boyer, Dr Robert M Boynton, Stanley Bram, Professor H J Bremermann, Dr Sidney Brenner, Dr K Brewerman, British Broadcasting Corporation (BBC), British Embassy, Thomas R Broker (and Louise T Chow), Dr Burt V Bronk, James Brown Associates, G G Brownlee (Fred Sanger: "this is the up-to-date version of the ØX sequence," Fig 1 from 14th Colworth Medal Lecture, included with correspondence), Felicity Bryan (Messrs Curtis Brown & Company), Dr Glenn L Bryan (Office of Naval Research), Professor Theodore H Bullock, Professor Mario Bunge, Dr Anthony W Burgess, Dr L A Burgoyne, David Burr, and Dr Robert Bywater.