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Gottfried Andreas Watermeyer
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Witwatersrand mining practice
Gottfried Andreas Watermeyer · Transvaal Chamber of Mines, Gold Producers' Committee
895 sayfa · 1932
Gold mines and mining / Mining engineering / Witwatersrand / Transvaal
Witwaterstrand mining practice
Gottfried Andreas Watermeyer · Transvaal Chamber of Mines, Gold Producers' Committee
895 sayfa · 1932
Gold mines and mining -- Transvaal -- Witwatersrand / Mining engineering