21. Letter from H. Gobind Khorana to Francis Crick Creator: Khorana, Har Gobind, 1922-2011 Date: 8 November 1968 Genre: Letters (correspondence)
22. Letter from Francis Crick to Arthur Kornberg Creator: Crick, Francis, 1916-2004 Date: 9 February 1962 Genre: Letters (correspondence)
23. Letter from Francis Crick to Arthur Kornberg Creator: Crick, Francis, 1916-2004 Date: 10 May 1960 Genre: Letters (correspondence)