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Guide to the map Bodenkarte von Nordrhein-Westfalen 1:50 000, issued by Geologischer Dienst NRW in printed analog and in updated digital format (information on the digital format at: http://www.gd.nrw.de/g_bk50d.htm - last viewed 10-13-2014.

Soils --- Bodenkarte von Nordrhein-Westfalen 1:50 000 --- North Rhine-Westphalia (Germany) --- Maps