1. Letter from Lewis Hackett to Fred L. Soper Publication: Produced: 12 January 1959 Subject(s): Insect ControlDDTYellow Fever Vaccine Archival Collection: The Fred L. Soper Papers (Profiles in Science)
2. Letter from Fred L. Soper to Lewis Hackett Publication: Produced: 20 January 1959 Subject(s): DDTInsect ControlYellow Fever Vaccine Archival Collection: The Fred L. Soper Papers (Profiles in Science)
3. The Conquest of Typhus Publication: New York Times Company, 4 June 1944 Subject(s): DDTTyphus, Epidemic Louse-BorneInsect Control Archival Collection: The Fred L. Soper Papers (Profiles in Science)