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Keywords: Andreas Sigismund Marggraf-flip.jpg Engraving of en Andreas Sigismund Marggraf flipped so he is facing left Scanned from cite book Weeks Mary Elvira 1933 The Discovery of the Elements Journal of Chemical Education Easton PA III Some Eighteenth-Century Metals 20 0766138720 CITEREFWeeks1933 from an engraving originally created in circa 1770 ca 1770 Author PD-old thumb upright Original version For use when left aligned Andreas Sigismund Marggraf Men facing left and looking left |