1. Letter from Roy Curtiss III to Donald S. Fredrickson Publication: Produced: 12 April 1977 Subject(s): DNA, RecombinantGenetic ResearchEscherichia coliRisk Management Archival Collection: The Maxine Singer Papers (Profiles in Science)
2. Letter from Joshua Lederberg to U.S. Senators Alan Cranston and Samuel Ichiye Hayakawa Publication: Produced: [ca. 9 June 1977] Subject(s): DNA, RecombinantGenetic ResearchRisk Management Archival Collection: The Maxine Singer Papers (Profiles in Science)
3. Letter from Roy Curtiss III to Donald S. Fredrickson Publication: Produced: 23 September 1978 Subject(s): DNA, RecombinantGuidelines as TopicGenetic ResearchRisk Management Archival Collection: The Maxine Singer Papers (Profiles in Science)
4. Letter from Stanley N. Cohen to Maxine Singer Publication: Produced: 25 September 1978 Subject(s): DNA, RecombinantGuidelines as TopicRisk Management Archival Collection: The Maxine Singer Papers (Profiles in Science)