31. Letter from Warren Weaver to Francis Crick Creator: Weaver, Warren, 1894-1978 Date: 21 May 1965 Genre: Letters (correspondence)
32. Letter from Vernon M. Ingram to Francis Crick Creator: Ingram, Vernon M. Date: 15 March 1960 Genre: Letters (correspondence)
33. Letter from Vernon M. Ingram to Francis Crick Creator: Ingram, Vernon M. Date: 4 May 1965 Genre: Letters (correspondence)
34. Letter from Sydney Brenner to Francis Crick Creator: Brenner, Sydney Date: 27 July 1961 Genre: Letters (correspondence)
35. Letter from Sydney Brenner to Francis Crick Creator: Brenner, Sydney Date: 24 March 1959 Genre: Letters (correspondence)
36. Letter from Severo Ochoa to Francis Crick Creator: Ochoa, Severo, 1905-1993 Date: 15 November 1962 Genre: Letters (correspondence)
37. Letter from P. M. Bhargava, Regional Research Laboratory (Hyderabad, India) to Francis Crick Creator: Bhargava, P. M.Regional Research Laboratory (Hyderabad, India) Date: 6 November 1963 Genre: Letters (correspondence)
38. Letter from Marshall W. Nirenberg to Francis Crick Creator: Nirenberg, Marshall W. Date: 7 May 1966 Genre: Letters (correspondence)
39. Letter from Marshall W. Nirenberg to Francis Crick Creator: Nirenberg, Marshall W. Date: 16 November 1962 Genre: Letters (correspondence)
40. Letter from Marshall W. Nirenberg to Francis Crick Creator: Nirenberg, Marshall W. Date: 1 June 1965 Genre: Letters (correspondence)