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Smallpox Vaccine
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10
Smallpox -- prevention & control
5
Vaccination
3
Argentina
1
Cowpox
1
Mexico
1
National Vaccine Institution (U.S. : Proposed)
1
Philadelphia
1
Salvany, Josep.
1
Smallpox
1
Smallpox -- therapy
1
United States
1
United States Government Agencies
1
Vaccination -- legislation & jurisprudence
1