section of a sound in the coal limestone before the leaching of the valley (above). Average of a grotto in the coal limestone (below), 1874

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Photo credit: © Quagga Media / Alamy / Afripics
License: Licensed
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Keywords: art, black, charbon, coal, cut, draw, drawing, engraving, histoire, historical, illustration, illustrations, kohle, line, lineart, monochrome, prehistoric, prehistory, préhistorique, vintage, vorgeschichte, vorgeschichtlich, white, wood, woodcut, woodengraving