1. Letter from Daniel Nathans to Ernest Winocour Creator: Nathans, Daniel, 1928-1999 Date: 18 August 1969 Genre: Letters (correspondence)
2. SV 40 Prep Creator: Nathans, Daniel, 1928-1999 Date: 31 March 1969 Genre: Laboratory notebooksExcerpts
3. SV 40 Prep Creator: Nathans, Daniel, 1928-1999 Date: [ca. 1969] Genre: Laboratory notebooksExcerpts