 |
| |||
| development of environment; environmental enhancement; natural environment enhancement (Konstantin 1966) | |||
| environmental improvement | |||
| улучшение качества окружающей среды: 7 a las frases, 3 temas |
| Ecología | 5 |
| Industria energetica | 1 |
| Suministro de agua | 1 |
|
| |||
| development of environment; environmental enhancement; natural environment enhancement (Konstantin 1966) | |||
| environmental improvement | |||
| улучшение качества окружающей среды: 7 a las frases, 3 temas |
| Ecología | 5 |
| Industria energetica | 1 |
| Suministro de agua | 1 |