| 03020 | Sociology. Demography |
| 03040 | Labour. Employment |
| 03060 | Finances. Banking. Monetary systems. Insurance |
| 03080 | Services |
| 03100 | Company organization and management |
| 03120 | Quality |
| 03140 | Patents. Intellectual property |
| 03160 | Law. Administration |
| 03180 | Education |
| 03200 | Leisure. Tourism |
| 03220 | Transport |
| 03240 | Postal services |
