International standard classification of occupations.
International standard classification of occupations.
- Geneva, 1958.
- iii, 236 p. 28 cm.
l 59000107 //r84
Occupations--Classification.
HB2581 / .I63
331.7
l 59000107 //r84
Occupations--Classification.
HB2581 / .I63
331.7