 |
| |||
| prevention of air pollution | |||
| Reinhaltung der Luft: 8 phrases in 6 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| Environment | 3 |
| General | 1 |
|
| |||
| prevention of air pollution | |||
| Reinhaltung der Luft: 8 phrases in 6 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| Environment | 3 |
| General | 1 |