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Fotothek df tg 0002797 Bergbau ^ Metallurgie ^ Erz ^ Trennen ^ Waschen
Original image description from the Deutsche FotothekBergbau & Metallurgie & Erz & Trennen & Waschen
Fotothek df tg 0003432 Bergbau
Original image description from the Deutsche FotothekBergbau Public domain scan of 16th-century scientific illustration, free to use, no copyright restrictions image - Picryl description