 |
| ecological monitoring: 8 phrases in 5 subjects |
| Astronautics | 1 |
| Ecology | 1 |
| General | 1 |
| Security systems | 2 |
| Weapons of mass destruction | 3 |
|
| ecological monitoring: 8 phrases in 5 subjects |
| Astronautics | 1 |
| Ecology | 1 |
| General | 1 |
| Security systems | 2 |
| Weapons of mass destruction | 3 |