1. Letter from Daniel Nathans to Paul Berg Publication: Produced: 14 February 1978 Subject(s): DNA, RecombinantGuidelines as TopicLegislation as Topic Archival Collection: The Daniel Nathans Papers (Profiles in Science)
2. Letter from Daniel Nathans to Paul Berg Publication: Produced: 23 July 1973 Subject(s): Guidelines as Topic Archival Collection: The Daniel Nathans Papers (Profiles in Science)