21. Letter from Francis Crick to Nathan M. Pusey, Harvard University Creator: Crick, Francis, 1916-2004 Date: 23 December 1966 Genre: Letters (correspondence)
22. Letter from Nathan M. Pusey, Harvard University to Francis Crick Creator: Pusey, Nathan M.Harvard University Date: 13 January 1967 Genre: Letters (correspondence)
23. Letter from James D. Watson to Maurice Wilkins Creator: Watson, James D., 1928- Date: 28 November 1966 Genre: Letters (correspondence)
24. Letter from Francis Crick to Nathan M. Pusey, Harvard University Creator: Crick, Francis, 1916-2004 Date: 1 December 1966 Genre: Letters (correspondence)
25. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 1 November 1966 Genre: Letters (correspondence)
26. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 23 November 1966 Genre: Letters (correspondence)
27. Letter from Francis Crick to James D. Watson Creator: Crick, Francis, 1916-2004 Date: 10 October 1966 Genre: Letters (correspondence)
28. Letter from Maurice H. F. Wilkins to James D. Watson Creator: Wilkins, Maurice, 1916-2004 Date: 6 October 1966 Genre: Letters (correspondence)
29. Letter from James D. Watson to Francis Crick Creator: Watson, James D., 1928- Date: 19 October 1966 Genre: Letters (correspondence)
30. Letter from Francis Crick to Thomas J. Wilson, Harvard University Press Creator: Crick, Francis, 1916-2004 Date: 21 October 1966 Genre: Letters (correspondence)