1. Postcard from Luca Cavalli-Sforza to Joshua and Esther Lederberg Publication: Produced: 13 August 1959 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Postcard from Luca Cavalli-Sforza to Joshua and Esther Lederberg Publication: Produced: June 1963 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)