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Erbstollen. Kronprinz FriedrichWilhelm Erbstollen Crown Prince FriedrichWilhelm gallery located in Kreuztal NorthrhineWestphalia Germany commemorative plaque with section of the mine The erbstollen is the long horizontal gallery exiting at Kreuztal it helped drain the mine from groundwater Kronprinz FriedrichWilhelm Erbstollen Kreuztal