11. Letter from C.M.F. to C.G.S. Publication: Produced: 3 January 1944 Subject(s): Organization and AdministrationTyphus, Epidemic Louse-Borne Archival Collection: The Fred L. Soper Papers (Profiles in Science)
12. 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)