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Keywords: Meyers b2 s0724 b2.png de Firstenbau Bergbau a “ Schacht b “ Grundstrecke c “ Firstengewölbe d e f “ Stöße g “ taubes Gestein h “ Rollloch Meyers b2 s0724 jpg ca 1885 author PD-Meyers Mining schemas and diagrams Images from Meyers Konversationslexikon 4th edition - text figures
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