1. Letter from Bryce Crawford, Jr., National Academy of Sciences to Joshua Lederberg Publication: Produced: 5 February 1982 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Letter from Bryce Crawford, Jr., National Academy of Sciences to Joshua Lederberg Publication: Produced: 25 October 1982 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)