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. Onchocerciasis in Ghana Publication: [Bethesda, Md.] : National Cancer Institute ; [Atlanta : for loan by National Medical Audiovisual Center ; Washington : for sale by National Audiovisual Center, 1967] Subject(s): DDTInsect ControlInsect VectorsOnchocerciasis
