| Naics index | Naics index description |
|---|---|
| 541330 | Erosion control engineering services |
| 541330 | Geological engineering services |
| 541330 | Geophysical engineering services |
| 541330 | Heating engineering consulting services |
| 541330 | Industrial engineering services |
| 541330 | Logging engineering services |
| 541330 | Marine engineering services |
| 541330 | Maritime technology engineering services |
| 541330 | Mechanical engineering services |
| 541330 | Mining engineering services |