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Vaccination: advice on the necessity of vaccination : the value of vaccination, the tests of successful vaccination, how often revaccination should be done, the quality of vaccine, the best way to use vaccine, how to prevent and exterminate small-pox, the construction of small-pox hospitals, etc
Vaccination: advice on the necessity of vaccination : the value of vaccination, the tests of successful vaccination, how often revaccination should be done, the quality of vaccine, the best way to use vaccine, how to prevent and exterminate small-pox, the construction of small-pox hospitals, etc