'In 1956 Jonas Salk & Leonard Scheele said Salk's vaccine should eliminate this disease within 3 years'
polio
U.S. HISTORY: In 1956 Jonas Salk & Leonard Scheele said Salks vaccine should eliminate this disease within 3 years
In 1956 Jonas Salk & Leonard Scheele said Salk's vaccine should eliminate this disease within 3 years
In 1956 Jonas Salk & Leonard Scheele said Salk's vaccine should eliminate this disease within 3 years
U.S. HISTORY
polio
U.S. HISTORY