Jrohaunesburg Gold Fields Described. Temperatures at Great Depths. AT WHAT DEPTH AND TEMPERATURE CAN OUR MINERS WORK? 6 5 le 4 SOr, scientific american, 1896-04-11
Jrohaunesburg Gold Fields Described. Temperatures at Great Depths. AT WHAT DEPTH AND TEMPERATURE CAN OUR MINERS WORK? 6 5 le 4 SOr, scientific american, 1896-04-11
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