Agricola, Georgius, De re metallica, 1912/1950

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1Excavations of this kind were called by the Greeks κρυπται for, extending
along after the manner of a tunnel, they are entirely hidden within the
54[Figure 54]
THREE INCLINED SHAFTS, OF WHICH A DOES NOT YET REACH THE TUNNEL; B REACHES THE
TUNNEL; TO THE THIRD, C, THE TUNNEL HAS NOT YET BEEN DRIVEN. D—TUNNEL.

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