TY  - BOOK
ED  - World Health Organization
TI  - Polio the beginning of the end / World Health Organization
U1  - B 16.6132 WHO -8154   
CY  - Geneva, 1997.
KW  - Poliomyelitis
KW  - Vaccination
KW  - Immunization of children
KW  - HEA
ER  -