1. Letter from Paul Berg to Daniel Nathans Publication: Produced: 6 February 1978 Subject(s): DNA, RecombinantGuidelines as TopicLegislation as Topic Archival Collection: The Daniel Nathans Papers (Profiles in Science)
2. Letter from Paul Berg to Daniel Nathans Publication: Produced: 13 September 1977 Subject(s): DNA, RecombinantLegislation as TopicGuidelines as Topic Archival Collection: The Daniel Nathans Papers (Profiles in Science)