 |
| sand filter: 71 phrases in 27 subjects |
| Aviation | 1 |
| Cement | 1 |
| Construction | 5 |
| Ecology | 4 |
| Electronics | 5 |
| Energy industry | 3 |
| Fish farming pisciculture | 1 |
| General | 3 |
| Geology | 2 |
| Hydraulic engineering | 1 |
| Karachaganak | 1 |
| Makarov | 3 |
| Medical | 2 |
| Military | 2 |
| Mining | 3 |
| Natural resourses and wildlife conservation | 6 |
| Oil / petroleum | 8 |
| Oil and gas | 2 |
| Oil and gas technology | 2 |
| Rail transport | 1 |
| Sakhalin | 2 |
| Sakhalin R | 1 |
| Seismology | 1 |
| Technology | 7 |
| Tengiz | 1 |
| Transport | 1 |
| Water supply | 2 |