Coal production in the Ruhr district (end of May 1920) enquiry by the International Labour Office.

Coal production in the Ruhr district (end of May 1920) enquiry by the International Labour Office.

Bibliografiset tiedot
Yhteisötekijät: International Labor Office, Berthelot, M, International Labour Office, Lazard, M
Aineistotyyppi: Kirja
Kieli:English
Julkaistu: [Geneva] Nendehln, Kraus Reprint 1975, 1920.
Sarja:Studies and documents. Series B nos. 1-13
Aiheet:
Coal miners > Germany > Wetphalia.
Coal mines and mining > Germany > Westphalia.
Ruhr river and valley.