@book{ 0-111314887X, title = {Übersicht über die nutzbaren Bodenschätze Spaniens}, series = {Internationale Bergwirtschaft / Beihefte}, author = {Schumacher, Friedrich and Dannenberg, Arthur and Harbort, Erich}, address = {Leipzig}, publisher = {Hirschfeld}, year = {1926}, language = {German}, url = {https://katalog.ub.tu-freiberg.de/Record/0-111314887X} }