@Misc{130734365,
title="Cooperative mining series",
year="1918",
month="1930",
publisher="Schnepp {\&} Barnes",
address="Urbana, Ill.",
note="State of Illinois, Department of Registration and Education, Division of the State Geological Survey",
note="19.1919; 21.1918 - 33.1930; damit Ersch. eingest.",
note="Springende Ersch.-Jahre",
note="Auch als Mikrofiche-Ausg.",
note="Auch als Mikrofiche-Ausg",
language="Undetermined language"
}