| |||
| mesure des poussières | |||
|
dust sampling : 6 phrases in 3 subjects |
| Coal | 1 |
| Environment | 3 |
| Natural resourses and wildlife conservation | 2 |
| |||
| mesure des poussières | |||
|
dust sampling : 6 phrases in 3 subjects |
| Coal | 1 |
| Environment | 3 |
| Natural resourses and wildlife conservation | 2 |