41. Letter from Henry R. V. Arnstein to Francis Crick Creator: Arnstein, Henry R. V. Date: 20 November 1969 Genre: Letters (correspondence)
42. Letter from Francis Crick to Sewell Champe Creator: Crick, Francis, 1916-2004 Date: 24 October 1966 Genre: Letters (correspondence)
43. Letter from Francis Crick to Henry R. V. Arnstein Creator: Crick, Francis, 1916-2004 Date: 14 November 1969 Genre: Letters (correspondence)
44. Letter from Sewell Champe to Francis Crick Creator: Champe, Sewell Date: 1 March 1967 Genre: Letters (correspondence)
45. Letter from Francis Crick to Sewell Champe Creator: Crick, Francis, 1916-2004 Date: 6 March 1967 Genre: Letters (correspondence)
46. Letter from Francis Crick to Sewell Champe Creator: Crick, Francis, 1916-2004 Date: 2 November 1966 Genre: Letters (correspondence)
47. Letter from Sewell Champe to Francis Crick Creator: Champe, Sewell Date: 9 October 1966 Genre: Letters (correspondence)
48. Letter from Francis Crick to Paul Doty Creator: Crick, Francis, 1916-2004 Date: 17 April 1967 Genre: Letters (correspondence)
49. Letter from Francis Crick to Bernard D. Davis Creator: Crick, Francis, 1916-2004 Date: 22 April 1970 Genre: Letters (correspondence)
50. Letter from Francis Crick to Alexander Rich Creator: Crick, Francis, 1916-2004 Date: 4 September 1974 Genre: Letters (correspondence)