told me additional information about how he created his vaccine.The Hall of Science and Exploration: Interview page 3; 1-26-99 *http://www.achievement.org/autodoc/page/sal0bio-3*The interview gave me knowledge of how Dr. Salk thought and felt about what he was doing. It also told me additional information about how he created his vaccine.Hargrove, Jim. The Story of Jonas Salk and the Discovery of the Polio Vaccine. Childrens Press: Chicago, 1990This book told me how Jonas Salk conducted his research and what some of his results were. This may have been my most helpful source. ...