Self-wage bill
A self-wage mine is a mine that may not be operated by more than eight people. Of these, at least four have to do work with their own hands.
Individual evidence
- ^ Herbert Stahl (editor), Gerhard Geurts , Hans-Dieter Hilden, Herbert Ommer , Siegfried Raimann: Das Erbe des Erzes. Volume 4: Der Lüderich (= series of publications by the Bergisches Geschichtsverein. Department Rheinisch-Bergischer Kreis. Vol. 52). Friends of the Bergisches Museum for Mining, Crafts and Trades, Bergisch Gladbach 2008, ISBN 978-3-932326-52-3 , glossary p. 241.