31. Letter from Sol Spiegelman to Joshua Lederberg Creator: Spiegelman, Sol, 1914-1983 Date: 19 May 1950 Genre: Letters (correspondence)
32. Letter from Sol Spiegelman to Martin R. Pollock Creator: Spiegelman, Sol, 1914-1983 Date: 1 October 1951 Genre: Letters (correspondence)
33. Letter from Sol Spiegelman to Martin R. Pollock Creator: Spiegelman, Sol, 1914-1983 Date: 17 July 1957 Genre: Letters (correspondence)
34. Letter from Sol Spiegelman to Martin R. Pollock Creator: Spiegelman, Sol, 1914-1983 Date: 14 August 1951 Genre: Letters (correspondence)
35. Letter from Sol Spiegelman to Martin R. Pollock Creator: Spiegelman, Sol, 1914-1983 Date: 7 April 1947 Genre: Letters (correspondence)
36. Letter from Sol Spiegelman to H. B. Steinbach Creator: Spiegelman, Sol, 1914-1983 Date: 25 October 1947 Genre: Letters (correspondence)
37. Letter from Sol Spiegelman to Martin R. Pollock Creator: Spiegelman, Sol, 1914-1983 Date: 19 October 1951 Genre: Letters (correspondence)
38. Letter from Sol Spiegelman to Tracy M. Sonneborn Creator: Spiegelman, Sol, 1914-1983 Date: 27 November 1950 Genre: Letters (correspondence)
39. Letter from Sol Spiegelman to Tracy M. Sonneborn Creator: Spiegelman, Sol, 1914-1983 Date: 15 November 1950 Genre: Letters (correspondence)
40. Letter from Sol Spiegelman to Van R. Potter Creator: Spiegelman, Sol, 1914-1983 Date: 7 May 1945 Genre: Letters (correspondence)