1. Letter from Fred L. Soper to Lewis Hackett Creator: Soper, Fred Lowe, 1893-1977 Date: 18 October 1955 Genre: Letters (correspondence)
2. Letter from Lewis Hackett to Fred L. Soper Creator: Hackett, Lewis Date: 12 October 1955 Genre: Letters (correspondence)
3. Deadly Mosquito Wiped Out in Brazil Date: 19 March 1941 Publisher: New York Times Company Genre: Articles
4. Vaccination with Virus 17D in the Control of Jungle Yellow Fever in Brazil Creator: Soper, Fred Lowe, 1893-1977Smith, H. H. Date: 1938 Publisher: Undetermined Genre: Articles