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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:

new disease

14 дек 2018

1

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560

Дата:

18 март 1854 г.

Сейчас

~ 171 г назад

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