00535cam a2200193 4500 l 59000107 DLC 20260227111545.0 700725s1958 sz 00100 eng c l 59000107 //r84 U.S. Dept. of Labor. Library HB2581 .I63 331.7 International Labour Office. International standard classification of occupations. Geneva, 1958. iii, 236 p. 28 cm. Occupations Classification. 37001 37001