The ignition of firedamp by the heat of impact of hand picks against rocks
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書誌事項
The ignition of firedamp by the heat of impact of hand picks against rocks
（Safety in mines research board paper, no. 62）
Printed and published by H.M. Stationery, 1930
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注記
At head of title: Mines department
"Safety in mines research board publications": p. [22]-[24]