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Veredlung der Ruhrkohle. Koks- und Gaserzeugung, Kohlenwertstoffgewinnung, Brikettherstellung. Landesplanungsbehörde. Januar 1950. Nordrhein-Westfalen-Atlas [B1.2] I A. Bagel, Düsseldorf
Veredlung der Ruhrkohle. Koks- und Gaserzeugung, Kohlenwertstoffgewinnung, Brikettherstellung. Landesplanungsbehörde. Januar 1950. Nordrhein-Westfalen-Atlas [B1.2] I A. Bagel, Düsseldorf