 |
| |||
| lignite | |||
| lignite Coal of relatively recent origin consisting of accumulated layers of partially decomposed vegetation, intermediate between peat and bituminous coal; often contains patterns from the wood from which it formed | |||
| wood coal | |||
| brown coal | |||
|
lignito : 57 do fraz, 13 tematyki |
| Chemia | 5 |
| Elektronika | 1 |
| Geologia | 1 |
| Inżynieria mechaniczna | 1 |
| Nauki o życiu | 2 |
| Ochrona środowiska | 5 |
| Pospolicie | 1 |
| Przemysł | 2 |
| Przemysł energetyczny | 10 |
| Ropa / ropa naftowa | 2 |
| Statystyka | 3 |
| Węgiel | 20 |
| Wiercenie | 4 |