00529nam a2200121Ia 4500008004100000040001700041082002400058110005200082245016500134260002200299300001000321650007600331190327s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta371.425bI61I  aInternational Labour Office (7th: 1949: Geneva) 0aInternational standard classification of occupationsbreport prepared for the seventh International conference of labour statisticican (Geneva, September, 1949)  aGenevabILOc1949  a139p.  aProfessional education; Occupations-Classiciation; Education-Statistics