1. Letter from Barbara McClintock to Almiro Blumenschein Publication: Produced: 20 August 1966 Subject(s): ChromosomesZea maysCooperative BehaviorMaps as Topic Archival Collection: The Barbara McClintock Papers (Profiles in Science)
2. Letter from Dudley A. Reekie to Fred L. Soper Publication: Produced: 30 August 1943 Subject(s): Financial SupportCooperative BehaviorTyphus, Epidemic Louse-Borne Archival Collection: The Fred L. Soper Papers (Profiles in Science)
3. Letter from Fred L. Soper to Dudley A. Reekie Publication: Produced: 16 September 1943 Subject(s): Typhus, Epidemic Louse-BorneCooperative BehaviorLice Infestations Archival Collection: The Fred L. Soper Papers (Profiles in Science)
4. Letter from Fred L. Soper to Wilbur A. Sawyer Publication: Produced: 7 February 1944 Subject(s): Typhus, Epidemic Louse-BorneCooperative BehaviorLice Infestations Archival Collection: The Fred L. Soper Papers (Profiles in Science)
5. Letter from Raymond L. Latarjet to Joshua Lederberg Publication: Produced: 14 August 1946 Subject(s): Cooperative Behavior Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
6. Letter from Raymond L. Latarjet to Joshua Lederberg Publication: Produced: 25 April 1950 Subject(s): Cooperative BehaviorRadiation Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
