1. Letter from Linus Pauling to Francis Crick Creator: Pauling, Linus, 1901-1994 Date: 18 February 1963 Genre: Letters (correspondence)
2. Letter from Linus Pauling to Francis Crick Creator: Pauling, Linus, 1901-1994 Date: 25 April 1967 Genre: Letters (correspondence)
3. Letter from Linus Pauling to Francis Crick Creator: Pauling, Linus, 1901-1994 Date: 19 September 1974 Genre: Letters (correspondence)