1. Letter from Martin R. Pollock to Sol Spiegelman Creator: Medical Research Council. The Lister InstitutePollock, Martin, 1909-2002 Date: 18 March 1947 Genre: Letters (correspondence)
2. Letter from Martin R. Pollock to Sol Spiegelman Creator: The Medical Research Council. National Institute for Medical ResearchPollock, Martin, 1909-2002 Date: 16 October 1951 Genre: Letters (correspondence)
3. Letter from Martin R. Pollock to Sol Spiegelman Creator: The Medical Research Council. National Institute for Medical ResearchPollock, Martin, 1909-2002 Date: 11 September 1951 Genre: Letters (correspondence)
4. Letter from Martin R. Pollock to Sol Spiegelman Creator: The Medical Research Council. National Institute for Medical ResearchPollock, Martin, 1909-2002 Date: 22 July 1957 Genre: Letters (correspondence)