41. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 19 November 1956 Genre: Letters (correspondence)
42. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 22 November 1954 Genre: Letters (correspondence)
43. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 10 February 1955 Genre: Letters (correspondence)
44. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 3 March 1955 Genre: Letters (correspondence)
45. Letter from Francis Crick to Andre Lwoff, Institut Pasteur (France) Creator: Crick, Francis, 1916-2004 Date: 25 September 1957 Genre: Letters (correspondence)
46. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 11 December 1954 Genre: Letters (correspondence)
47. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 15 October 1954 Genre: Letters (correspondence)
48. Letter from Francis Crick to Igor Y. Tamm Creator: Crick, Francis, 1916-2004 Date: 5 December 1962 Genre: Letters (correspondence)
49. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: [14 January 1954] Genre: Letters (correspondence)
50. Letter from Igor Y. Tamm to Francis Crick Creator: Tamm, Igor Y. Date: 9 November 1962 Genre: Letters (correspondence)