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Start Over Subjects Smallpox Vaccine -- therapeutic use ✖Remove constraint Subjects: Smallpox Vaccine -- therapeutic use Subjects Smallpox -- prevention & control ✖Remove constraint Subjects: Smallpox -- prevention & control Languages Chinese ✖Remove constraint Languages: Chinese Copyright Copyright may apply ✖Remove constraint Copyright: Copyright may apply Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999 Publication Year 1956 ✖Remove constraint Publication Year: 1956

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