1. Letter from Paul Berg to Donald S. Fredrickson Publication: Produced: 20 August 1979 Subject(s): DNA, RecombinantEscherichia coli Archival Collection: The Paul Berg Papers (Profiles in Science)
2. Letter from David A. Jackson to Aaron J. Shatkin Publication: Produced: 13 January 1975 Subject(s): DNA, RecombinantEscherichia coli Archival Collection: The Daniel Nathans Papers (Profiles in Science)
3. 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)
4. Letter from Maxine Singer to London Ganning Publication: Produced: 13 August 1979 Subject(s): DNA, RecombinantEscherichia coli Archival Collection: The Maxine Singer Papers (Profiles in Science)
5. Letter from Paul Berg to Donald S. Fredrickson Publication: Produced: 17 December 1979 Subject(s): DNA, RecombinantEscherichia coli Archival Collection: The Paul Berg Papers (Profiles in Science)