 |
| изследователски: 17 phrases in 7 subjects |
| Coal | 1 |
| Construction | 5 |
| Economy | 7 |
| Education | 1 |
| Environment | 1 |
| Mineral products | 1 |
| Research and development | 1 |
|
| изследователски: 17 phrases in 7 subjects |
| Coal | 1 |
| Construction | 5 |
| Economy | 7 |
| Education | 1 |
| Environment | 1 |
| Mineral products | 1 |
| Research and development | 1 |