International standard classification of occupations. - Rev. ed. 1968. - Geneva International Labour Office 1969. - vi, 355 p. 920713 LCCN: 71476976 //r84 Nat. Bib. No.: Sw69-A-4829 Subjects--Topical Terms: Occupations--Classification. LC Class. No.: HB2581 / .I63 1969 Dewey Class. No.: 331.7/001/2