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Ch. 10: The Essential Combination

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320 THE DIAMOND MINES OF SOUTH AFRICA
loose ground above, thus forming long galleries, filled more or less with blue ground, upon which the
men stand when drilling holes in the backs. The working levels were at first 30 feet apart vertically, but, for greater economy,
Ch. 10: The Essential Combination Page of 449 Ch. 10: The Essential Combination
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