 |
| |||
| sewage gas | |||
| gaz de boue: 9 phrases in 6 subjects |
| Bioenergy | 2 |
| Chemistry | 1 |
| Environment | 3 |
| Metallurgy | 1 |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 1 |
|
| |||
| sewage gas | |||
| gaz de boue: 9 phrases in 6 subjects |
| Bioenergy | 2 |
| Chemistry | 1 |
| Environment | 3 |
| Metallurgy | 1 |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 1 |