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Start Over Formats Still image ✖Remove constraint Formats: Still image Subjects Smallpox Vaccine -- therapeutic use ✖Remove constraint Subjects: Smallpox Vaccine -- therapeutic use Languages Chinese ✖Remove constraint Languages: Chinese Dates by Range 1950-1999 ✖Remove constraint Dates by Range: 1950-1999 Publication Year 1956 ✖Remove constraint Publication Year: 1956

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