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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 Subjects China ✖Remove constraint Subjects: China Subjects Health Education ✖Remove constraint Subjects: Health Education Titles Yu fang tian hua, kuai zhong niu dou ✖Remove constraint Titles: Yu fang tian hua, kuai zhong niu dou Publication Year 1956 ✖Remove constraint Publication Year: 1956

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