File:Coal supply in the German Empire Ruhr.jpg: Revision history

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19 October 2018

  • curprev 07:1307:13, 19 October 2018‎ RPetitpierre talk contribs‎ 236 bytes +236‎ Karte über die Production, Consumtion und Circulation der mineralischen Brenstoffe in Preussen während des Jahres 1881, Schropp (Berlin), 1881. Zoom on the Ruhr. [https://gallica.bnf.fr/ark:/12148/btv1b53021137x.r=charbon?rk=278971;2]
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