1. Letter from Leon A. Heppel to Maxine Singer Creator: Heppel, Leon A.National Institutes of Health (U.S.) Date: 13 December 1955 Genre: Letters (correspondence)
2. Letter from Donald S. Fredrickson to Daniel E. Koshland, Jr Creator: Fredrickson, Donald S.National Institutes of Health (U.S.) Date: 23 August 1976 Genre: Letters (correspondence)
3. Letter from Wallace P. Rowe to Maxine Singer Creator: Rowe, Wallace, -1983National Institutes of Health (U.S.) Date: 11 August 1976 Genre: Letters (correspondence)
4. Letter from Robert C. Gallo to Maxine Singer Creator: Gallo, Robert C.National Institutes of Health (U.S.) Date: 21 April 1992 Genre: Letters (correspondence)
5. Letter from Bernadine Healy to Maxine Singer Creator: Healy, BernadineNational Institutes of Health (U.S.) Date: 12 December 1991 Genre: Letters (correspondence)
6. Letter from Leon A. Heppel to Maxine Singer Creator: Heppel, Leon A.National Institutes of Health (U.S.) Date: [28 December 1957?] Genre: Letters (correspondence)
7. Letter from Leon A. Heppel to Maxine Singer Creator: Heppel, Leon A.National Institutes of Health (U.S.) Date: [27 July 1958?] Genre: Letters (correspondence)
8. Letter from Leon A. Heppel to Maxine Singer Creator: Heppel, Leon A.National Institutes of Health (U.S.) Date: 27 October 1955 Genre: Letters (correspondence)