U.S. POLIO ASSN.
Home (AM & RP)
History (AM)
Geography (AM)
The Virus (RP)
Salk vs. Sabin (RP)
Extras (AM & RP)
Poliomyelitis
Discovered in the 18th Century...
Existing since
prehistory
Polio's History
Polio Around the World
Polio's Morphology