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 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)