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1Wien : Montan-Verlag,v : ill. ; 21 cm.
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2Wien : Verlag für Fachliteratur, G.m.b.H,v. : ill. ; 30 cm.
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3Published 1984### CRL customization ### ?> ### Add publisher and desc details ### ?>Shimla : Labour Bureau, Ministry of Labour & Rehabilitation, Dept. of Labour, Govt. of India, [1984-v. ; 29 cm.