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美国卫生研究院文献>Epidemiology and Infection
>The Relation of the Decline in the Number of Horse-drawn Vehicles and consequently of the Urban Breeding-Grounds of Flies to the Fall in the Summer Diarrhoea Death-rate
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The Relation of the Decline in the Number of Horse-drawn Vehicles and consequently of the Urban Breeding-Grounds of Flies to the Fall in the Summer Diarrhoea Death-rate