6 3 0 . 7 ..... Ind ust rial ▁arbitr ation . ▁Med iation ▁and ▁conc ili ation ▁ 5 6 5 0 - 5 6 6 0 .... ... Employee ▁participation ▁in ▁management . ▁Employee ▁ownership . ▁Indust rial ▁dem ocracy . ▁Works ▁coun c ils ▁ 5 7 0 1 - 6 0 0 0 . 9 ..... L abor ▁market . ▁Labor ▁supply . ▁Labor ▁demand ▁( In cluding ▁un emp loyment , ▁man power ▁policy , ▁occup ational ▁training , ▁employ ment ▁ag encies ) ▁ 6 0 5 0 - 6 3 0 5 .... ... Classes ▁of ▁labor ▁( In cluding ▁women , ▁children , ▁students , ▁middle - aged ▁and ▁older ▁persons , ▁minor ities ) ▁ 6 3 5 0 - 6 9 4 0 . 7 ..... Tra de ▁un ions . ▁Labor ▁un ions . ▁Work ers ' ▁associations ▁ 6 9 4 1 - 6 9 4 8 .... ... Emp loy ers ' ▁associations ▁ 6 9 5 1 - 6 9 5 7 .... ... Ind ust rial ▁soci ology . ▁Social ▁conditions ▁of ▁labor ▁ 6 9 5 8 . 5 - 6 9 7 6 ..... Ind ust rial ▁relations ▁ 6 9 7 7 - 7 0 8 0 .... ... Cost ▁and ▁standard ▁of ▁living ▁ 7 0 8 8 - 7 2 5 2 .... ... So cial ▁ins urance . ▁Social ▁security . ▁P ension ▁ 7 2 5 5 - 7 2 5