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| consider this letter to be official notification | |||
| вважайте: 124 phrases in 15 subjects |
| American usage, not spelling | 4 |
| Astronautics | 2 |
| Aviation | 13 |
| Chemistry | 1 |
| Construction | 2 |
| Ecology | 1 |
| Environment | 1 |
| General | 21 |
| Information technology | 3 |
| Military | 14 |
| Mining | 1 |
| Nautical | 1 |
| Oil and gas | 58 |
| Radio | 1 |
| Space | 1 |