00465nam a22001577a 450000100060000000300100000600500170001604000140003300800410004702000180008811000680010624500550017426000410022930000100027065000270028015578MX-SIABUC20260702204728.0  aMX-SIABUC050528s1975    sz x   j            eng d  a92-2-101308-1 2aInternational Labour Organisation (9a. : 1975 : Ginebra, Suiza)0 aWorking environment in the iron and steel industry4 aGeneva ; International Labour Office4 a75 p.  a1.DERECHO DEL TRABAJO.