1. Letter from Henry R. V. Arnstein to Francis Crick Creator: Arnstein, Henry R. V. Date: 20 November 1969 Genre: Letters (correspondence)
2. Letter from Francis Crick to Henry R. V. Arnstein Creator: Crick, Francis, 1916-2004 Date: 14 November 1969 Genre: Letters (correspondence)
3. Letter from Francis Crick to Francois Gros Creator: Crick, Francis, 1916-2004 Date: 19 March 1969 Genre: Letters (correspondence)
4. Circular letter from the European Committee of Scientists for Democracy in Greece Creator: European Committee of Scientists for Democracy in Greece Date: [1969] Genre: Letters (correspondence)