 |
| |||
| extremely low frequency | |||
| very low sound frequency | |||
| subaudio frequency; subsonic frequency | |||
| infrasonic frequency | |||
| инфразвуковая частота: 16 phrases in 5 subjects |
| Aviation medicine | 1 |
| Geophysics | 12 |
| Makarov | 1 |
| Military | 1 |
| Technology | 1 |
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