 |
| |||
| bed of clay; clay layer; impervious soil | |||
| clay bed; clay pan | |||
| clay bank; clay seam; clay stratum | |||
| layer of clay | |||
| |||
| argillaceous sediments | |||
|
Tonschicht : 9 phrases in 6 subjects |
| Coal | 1 |
| General | 1 |
| Life sciences | 1 |
| Materials science | 1 |
| Mining | 4 |
| Transport | 1 |