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June 12, 1957
The National Polio Surveillance Program for 1957's outline of procedures, as well as, instructions on how to better record emerging cases.
The U. S. National Archives and Records Administration at Atlanta, 5780 Jonesboro Road, Morrow, GA 30260 www.archives.gov/atlanta
“1957 POLIO SURVEILLANCE PROGRAM,” The Global Health Chronicles, accessed December 8, 2019, https://globalhealthchronicles.org/items/show/6248.