 |
| |||
| bed of clay; clay layer; impervious soil | |||
| clay bed; clay pan | |||
| clay bank; clay seam; clay stratum | |||
| layer of clay | |||
| |||
| argillaceous sediments | |||
|
Tonschicht : 9 do fraz, 6 tematyki |
| Górnictwo | 4 |
| Inżynieria materiałowa | 1 |
| Nauki o życiu | 1 |
| Pospolicie | 1 |
| Transport | 1 |
| Węgiel | 1 |