 |
| storm runoff: 14 phrases in 6 subjects |
| Ecology | 6 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 4 |
| Oil / petroleum | 1 |
| Water resources | 1 |
| Weapons of mass destruction | 1 |
|
| storm runoff: 14 phrases in 6 subjects |
| Ecology | 6 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 4 |
| Oil / petroleum | 1 |
| Water resources | 1 |
| Weapons of mass destruction | 1 |