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| unconventional source | |||
| nontraditional source (ssn) | |||
| нетрадиционный источник: 24 phrases in 11 subjects |
| Ecology | 1 |
| Energy industry | 1 |
| Engines | 2 |
| Environment | 1 |
| Gas processing plants | 2 |
| General | 2 |
| Makarov | 2 |
| Oil and gas | 3 |
| Programming | 5 |
| Technology | 4 |
| Water resources | 1 |