John Snow and the removal of the Broad Street pump handle

ブロード・ストリートのコレラの大発生 - ドクター・ランカスター

John Snow and the removal of the Broad Street pump handle

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John Snow and the removal of the Broad Street pump handle

ブロード・ストリートのコレラの大発生 - ドクター・ランカスター

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