This primary source comes from the Collection DDE-WHCF: White House Central Files (Eisenhower Administration).
Full Citation: Remarks by Oveta Culp Hobby, Secretary of Health, Education, and Welfare, Given at a Conference on the Salk Polio Vaccine; 4/22/1955; OF 117-I-1 Salk Polio Vaccine (6); Official Files, 1953 - 1961; Collection DDE-WHCF: White House Central Files (Eisenhower Administration); Dwight D. Eisenhower Library, Abilene, KS. [Online Version, https://www.docsteach.org/documents/document/remarks-secretary-of-health-education-and-welfare-salk-polio-vaccine, May 7, 2024]