| Code | Description | Fiches |
|---|---|---|
| 620 | Engineering & allied operations | 59 |
| 621 | Applied physics | 150 |
| 622 | Mining & related operations | 12 |
| 623 | Military & nautical engineering | 36 |
| 624 | Civil engineering | 23 |
| 625 | Engineering of railroads, roads | 6 |
| 627 | Hydraulic engineering | 12 |
| 628 | Sanitary & municipal engineering | 10 |
| 629 | Other branches of engineering | 130 |