 |
| epuration: 179 phrases in 18 subjects |
| Agriculture | 4 |
| Chemistry | 15 |
| Coal | 3 |
| Earth sciences | 4 |
| Ecology | 4 |
| Economy | 1 |
| Environment | 111 |
| General | 8 |
| Human rights activism | 1 |
| Industry | 3 |
| Information technology | 1 |
| Life sciences | 3 |
| Medical | 12 |
| Metallurgy | 1 |
| Natural sciences | 1 |
| Politics | 1 |
| Technology | 1 |
| Transport | 5 |