Kessler-Slotta 1994 ; Hilz 2006 ; J. B. Ford: Images of Science 1992: 124 ; Nissen: Zoolog. Buchillustration 1969/78; Wolfgang Lefèvre: Picturing the world of mining (Berlin 2010 = www.mpiwg-berlin.mpg.de/Preprints/P407.pdf) ;
Also active in German lands; cf. also http://de.wikipedia.org/wiki/Christian_Zacharias_Koch#mediaviewer/File:Fotothek_df_tg_0000341_Bergwerk_^_Bergbau_^_Markscheider_^_Vermessung.jpg ;
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