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Start Over Subjects Yellow Fever ✖Remove constraint Subjects: Yellow Fever Subjects Philadelphia -- epidemiology ✖Remove constraint Subjects: Philadelphia -- epidemiology Subjects Mortality ✖Remove constraint Subjects: Mortality Authors Helmuth, Justus Henry Christian, 1745-1825 ✖Remove constraint Authors: Helmuth, Justus Henry Christian, 1745-1825 Languages English ✖Remove constraint Languages: English

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