| |||
charbon jaune | |||
charbon brun | |||
houille brune | |||
lignite m | |||
lignite récent |
brown coal : 29 phrases in 10 subjects |
Chemistry | 2 |
Coal | 7 |
Construction | 2 |
Energy industry | 5 |
General | 1 |
Industry | 2 |
Life sciences | 1 |
Metallurgy | 2 |
Natural resourses and wildlife conservation | 5 |
Statistics | 2 |