|
ground levels : 84 phrases in 15 subjects |
| Agriculture | 6 |
| Aviation | 3 |
| Construction | 10 |
| Earth sciences | 1 |
| Environment | 27 |
| Forestry | 1 |
| General | 3 |
| Life sciences | 3 |
| Mechanic engineering | 2 |
| Metallurgy | 3 |
| Natural resourses and wildlife conservation | 3 |
| Nuclear physics | 10 |
| Obsolete / dated | 1 |
| Soil science | 1 |
| Transport | 10 |