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18 marzo 1854 anni - John Snow

Descrizione:

60% of people frinking water from pump had cholera
VS 7% of people drinking from another pump
it was dirty water not miasma

Aggiunto al nastro di tempo:

new disease

14 dic 2018

1

0

550

Data:

18 marzo 1854 anni

Adesso

~ 171 years ago

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