21. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 27 September 1966 Genre: Letters (correspondence)
22. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 13 April 1967 Genre: Letters (correspondence)
23. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 1 November 1966 Genre: Letters (correspondence)
24. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 10 October 1966 Genre: Letters (correspondence)
25. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 30 October 1962 Genre: Letters (correspondence)
26. Letter from Francis Crick to James D. Watson (and notes concerning Watson's book, "The Double Helix") Creator: Crick, Francis, 1916-2004 Date: 31 March 1966 Genre: Letters (correspondence)Notes
27. Letter from Francis Crick to Lawrence Bragg Creator: Crick, Francis, 1916-2004 Date: 23 February 1967 Genre: Letters (correspondence)
28. Letter from Francis Crick to Maurice Wilkins Creator: Crick, Francis, 1916-2004 Date: 19 January 1967 Genre: Letters (correspondence)
29. Letter from Francis Crick to Maurice Wilkins Creator: Crick, Francis, 1916-2004 Date: 30 October 1962 Genre: Letters (correspondence)
30. Letter from Francis Crick to Nathan M. Pusey, Harvard University Creator: Crick, Francis, 1916-2004 Date: 23 December 1966 Genre: Letters (correspondence)