1. Letter from George Klein to Joshua and Esther Lederberg Creator: Klein, George Date: 31 May 1955 Genre: Letters (correspondence)
2. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 28 February 1955 Genre: Letters (correspondence)
3. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 9 October 1954 Genre: Letters (correspondence)
4. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 15 June 1955 Genre: Letters (correspondence)
5. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 29 March 1955 Genre: Letters (correspondence)
6. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 19 March 1955 Genre: Letters (correspondence)
7. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 24 September 1954 Genre: Letters (correspondence)
8. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 8 November 1952 Genre: Letters (correspondence)
9. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 1 March 1953 Genre: Letters (correspondence)
10. Letter from George Klein to Joshua Lederberg Creator: Klein, George Date: 28 November 1957 Genre: Letters (correspondence)