author = { Beyling, Carl AND Schultze-Rhonhof, Herbert },

title = { Die Versuchsgrube },

publisher = {Bertenburg},

year = {1929},

booktitle = {Berichte der Versuchsgrubengesellschaft ; 1},

address = { Gelsenkirchen },

url = { http://slubdd.de/katalog?TN_libero_mab2 }