41. Letter from Francis Crick to Marshall W. Nirenberg Creator: Crick, Francis, 1916-2004 Date: 29 January 1962 Genre: Letters (correspondence)
42. Letter from Francis Crick to Marshall W. Nirenberg Creator: Crick, Francis, 1916-2004 Date: 6 April 1965 Genre: Letters (correspondence)
43. Letter from Francis Crick to Robert L. Sinsheimer Creator: Crick, Francis, 1916-2004 Date: 9 October 1961 Genre: Letters (correspondence)
44. Letter from Francis Crick to Robert W. Holley Creator: Crick, Francis, 1916-2004 Date: 29 April 1965 Genre: Letters (correspondence)
45. Letter from Francis Crick to Robert W. Holley Creator: Crick, Francis, 1916-2004 Date: 30 November 1966 Genre: Letters (correspondence)
46. Letter from Francis Crick to Severo Ochoa Creator: Crick, Francis, 1916-2004 Date: 5 December 1962 Genre: Letters (correspondence)
47. Letter from Francis Crick to Severo Ochoa Creator: Crick, Francis, 1916-2004 Date: 21 September 1962 Genre: Letters (correspondence)
48. Letter from Francis Crick to Vernon M. Ingram Creator: Crick, Francis, 1916-2004 Date: 28 April 1965 Genre: Letters (correspondence)
49. Letter from Francis Crick to Vernon M. Ingram Creator: Crick, Francis, 1916-2004 Date: 26 March 1960 Genre: Letters (correspondence)
50. Letter from Francis Crick to Warren Weaver Creator: Crick, Francis, 1916-2004 Date: 6 July 1964 Genre: Letters (correspondence)