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並前往https://books.google.com.tw/books?id=WMcfAQAAIAAJ&pg=PA6&lpg=PA6&dq=opentopography&source=bl&ots=QjWvCOAuYq&sig=ACfU3U18ljcxzvsVIZRYIPSKLZx5v8_gww&hl=zh-TW&sa=X&ved=2ahUKEwig4eLMwPj3AhVqRDABHeI1BxgQ6AF6BQiYARAD

Public Health Papers and Reports - 第 4 卷 - 第 6 頁 - Google 圖書結果

... the great and sudden changes incident to our level and open topography , while , during the remaining months , it is injurious to health , on account of ...

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