1. Letter from Wilbur A. Sawyer to Fred L. Soper Publication: Produced: 8 December 1942 Subject(s): IranLice InfestationsTyphus, Epidemic Louse-Borne Archival Collection: The Fred L. Soper Papers (Profiles in Science)
2. Letter from Fred L. Soper to Leon A. Fox Publication: Produced: 2 September 1943 Subject(s): Typhus, Epidemic Louse-BorneLice Infestations 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)