@book{ Solr-7934406, title = {Veredlung der Ruhrkohle : Koks- und Gaserzeugung, Kohlenwertstoffgewinnung, Brikettherstellung}, editor = {North Rhine-Westphalia (Germany). Landesplanungsbehörde}, editor = {Deutsche Kohlenbergbau-Leitung Essen}, editor = {Ruhrgas AG Essen}, editor = {North Rhine-Westphalia (Germany). Oberbergamt in Dortmund}, address = {Düsseldorf}, publisher = {Landesplanungsbehörde}, year = {1950}, note = {Includes text and 8 graphs.}, note = {"Nordrhein-Westfalen-Atlas."}, note = {"Januar 1950."}, }