1. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 8 November 1950 Genre: Letters (correspondence)
2. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 21 November 1950 Genre: Letters (correspondence)
3. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 17 August 1946 Genre: Letters (correspondence)
4. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 6 August 1946 Genre: Letters (correspondence)
5. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 26 July 1946 Genre: Letters (correspondence)
6. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 19 September 1947 Genre: Letters (correspondence)
7. Letter from Tracy M. Sonneborn to Sol Spiegelman Creator: Indiana UniversitySonneborn, T. M. (Tracy Morton), 1905-1981 Date: 19 October 1946 Genre: Letters (correspondence)