1. The Polymerization of Guanosine Diphosphate by Polynucleotide Phosphorylase Creator: Singer, MaxineHeppel, Leon A.Hilmoe, Russell Date: March 1960 Publisher: American Society for Biochemistry and Molecular Biology Genre: Articles
2. The Mechanism of Action of Polynucleotide Phosphorylase Creator: Singer, MaxineHeppel, Leon A.Hilmoe, Russell Date: [1959] Publisher: New York Academy of Sciences Genre: Articles
3. 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)
4. 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)