History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c12.s1.t4.13
History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c12.s1.t4.13
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v1.c12.s1.t4.13
“I quote The Mining Journal — that the ancient miners had gone down over 400 ft (121.92 m) vertically in some of the hardest rock known to modern mining”.