International standard classification of occupations.
International Labour Office.
International standard classification of occupations. International Labour Office. - Rev. ed. 1968. - Geneva International Labour Office 1968 - vii, 355 p.
9.221e+009
331.70012 / ILO
International standard classification of occupations. International Labour Office. - Rev. ed. 1968. - Geneva International Labour Office 1968 - vii, 355 p.
9.221e+009
331.70012 / ILO