41. Letter from Leon A. Heppel to Maxine Singer Publication: Produced: 27 October 1955 Subject(s): Fellowships and Scholarships Archival Collection: The Maxine Singer Papers (Profiles in Science)
42. Letter from Leon A. Heppel to Maxine Singer Publication: Produced: [14 July 1958] Archival Collection: The Maxine Singer Papers (Profiles in Science)
43. Letter from Fred L. Soper to Wilbur A. Sawyer Publication: Produced: 7 July 1939 Subject(s): Mosquito ControlMalariaBudgetsFinancial Support Archival Collection: The Fred L. Soper Papers (Profiles in Science)
44. Letter from C. S. Stephenson to Wilbur A. Sawyer Publication: Produced: 9 December 1942 Subject(s): IranTyphus, Epidemic Louse-Borne Archival Collection: The Fred L. Soper Papers (Profiles in Science)
45. Letter from Henry Stimson to Fred L. Soper Publication: Produced: 31 May 1943 Subject(s): Typhus, Epidemic Louse-BorneAlgeria Archival Collection: The Fred L. Soper Papers (Profiles in Science)
46. 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)
47. 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)
48. 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)
49. Letter from Fred L. Soper to Lewis Hackett Publication: Produced: December 1939 Subject(s): Clothing Archival Collection: The Fred L. Soper Papers (Profiles in Science)
50. Letter from Fred L. Soper to Lewis Hackett Publication: Produced: 18 October 1955 Subject(s): Financial SupportMosquito ControlYellow Fever Vaccine Archival Collection: The Fred L. Soper Papers (Profiles in Science)
