1. Letter from Joshua Lederberg to Arie J. Haagen-Smit Publication: Produced: 11 November 1976 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Joshua Lederberg to Arie J. Haagen-Smit Publication: Produced: 11 November 1976 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)