1. Letter from Donald S. Fredrickson to Daniel E. Koshland, Jr Creator: Fredrickson, Donald S.National Institutes of Health (U.S.) Date: 23 August 1976 Genre: Letters (correspondence)
2. Speech by Maxine Singer at a National Academy of Sciences/Smithsonian Institution symposium Creator: Singer, Maxine Date: 27 October 1989 Genre: Speeches