 |
| |||
| Stromerzeugung der Wasserkraftwerke | |||
|
hydroelectric generation : 4 phrases in 2 subjects |
| Natural resourses and wildlife conservation | 3 |
| Technology | 1 |
|
| |||
| Stromerzeugung der Wasserkraftwerke | |||
|
hydroelectric generation : 4 phrases in 2 subjects |
| Natural resourses and wildlife conservation | 3 |
| Technology | 1 |