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18 март 1854 г. - John Snow

Описание:

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

Добавлено на ленту времени:

14 дек 2018
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Дата:

18 март 1854 г.
Сейчас
~ 171 г назад