Bend of the coals, , anonym (biology book, 1881), Biegung der Steinkohlen, Courbure des houilles

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Keywords: art, black, coal, cut, draw, drawing, drawn, engraving, flö, hand, historical, illustration, illustrations, kohle, line, lineart, monochrome, schichtung, seam, stratification, vintage, white, wood, woodcut, woodengraving