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18 mars 1854 - John Snow

Description:

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

Ajouté au bande de temps:

new disease

ByTassya
14 déc. 2018

Date:

18 mars 1854
Maintenaint
~ Il y a 170 ans
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