1. Letter from H. H. Dale to Alan Gregg Publication: Produced: 30 July 1931 Subject(s): Research Support as TopicViruses Archival Collection: The Alan Gregg Papers (Profiles in Science)
2. Letter from Alan Gregg to H. H. Dale Publication: Produced: 17 August 1931 Subject(s): Research Support as TopicViruses Archival Collection: The Alan Gregg Papers (Profiles in Science)