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並前往https://books.google.com.tw/books?id=ZTUjAQAAIAAJ&pg=PA76-IA192&lpg=PA76-IA192&dq=overhand+stoping&source=bl&ots=PWYHBmAL_r&sig=ACfU3U0XXTcxfnUZeqkDiWGyPPlNPJxTzA&hl=zh-TW&sa=X&ved=2ahUKEwihvOb-naL3AhVbHc0KHe4TB6gQ6AF6BQjUAhAD

Bulletin - 第 246-255 卷 - 第 76 頁 - Google 圖書結果

OVERHAND STOPING Accident reports for mines using overhand stoping methods were received from 81 companies employing 20,294 men underground who worked ...

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