Coal production in the Ruhr district (end of May 1920) enquiry by the International Labour Office. - International Labor Office; Berthelot, M; International Labor Office; International Labor Office; International Labor Office; International Labor Office; International Labor Office; International Labor Office; International Labor Office; International Labor Office; International Labor Office; International Labour Office; et al. ([Geneva] Nendehln, Kraus Reprint, 1975)
At head of title: International Labour Office, Geneva. September 1st, 1920.
Caption title.
Nos. 2- of this series have series title: Studies and reports.
Reprint of edition published by I. L. O.
This study was originally published in June 1920. cf. slip attached.
Bound with Berthelot, M. Work councils in Germany, Nendeln, 1975, 1924.
Keywords: Coal miners -- Germany -- Wetphalia; Coal mines and mining -- Germany -- Westphalia; Ruhr river and valley