1. Letter from Fred L. Soper to Lewis Hackett Creator: Soper, Fred Lowe, 1893-1977 Date: December 1939 Genre: Letters (correspondence)Poems
2. Letter from Fred L. Soper to Lewis Hackett Creator: Soper, Fred Lowe, 1893-1977 Date: 18 October 1955 Genre: Letters (correspondence)
3. Letter from Fred L. Soper to Wilbur A. Sawyer Creator: Soper, Fred Lowe, 1893-1977 Date: 7 July 1939 Genre: Letters (correspondence)
4. Letter from Fred L. Soper to Wilbur A. Sawyer Creator: Soper, Fred Lowe, 1893-1977 Date: 23 November 1938 Genre: Letters (correspondence)
5. Letter from George K. Strode to Wilbur A. Sawyer Creator: Strode, George K. Date: 2 January 1943 Genre: Letters (correspondence)
6. Letter from Lewis Hackett to Fred L. Soper Creator: Hackett, Lewis Date: 12 October 1955 Genre: Letters (correspondence)
7. Letter from Lewis Hackett to Fred L. Soper Creator: Hackett, Lewis Date: 15 December 1939 Genre: Letters (correspondence)Poems
8. Notecard with photo of the yellow fever laboratory in Rio de Janeiro, and inset photos of rhesus monkeys in lower corners Creator: Soper, Fred Lowe, 1893-1977 Date: [ca. 1938] Genre: Photographic printsLetters (correspondence)