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

Sonraí bibleagrafaíochta
Údair chorparáideacha: International Labor Office, Berthelot, M, International Labour Office, Lazard, M
Formáid: LEABHAR
Teanga:English
Foilsithe / Cruthaithe: [Geneva] Nendehln, Kraus Reprint 1975, 1920.
Sraith:Studies and documents. Series B nos. 1-13
Ábhair: