Dr. Jonas Salk first innoculated children at the D. T. Watson Home for Crippled Children in Leetsdale, Pennsylvania
On Jul. 2, 1952, Dr. Jonas Salk first innoculated children at the D. T. Watson Home for Crippled…
On Jul. 2, 1952, Dr. Jonas Salk first innoculated children at the D. T. Watson Home for Crippled…