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| fast wave (S1 MichaelBurov) | |||
| personnel office (Cmilana); personnel officer (Киселев voen14); personnel staff officer | |||
| the first peak measured by Rock-Eval (S1 is the milligrams of hydrocarbons that can be thermally distilled from 1 gm of rock); lower Silurian | |||
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| Personnel Staff Officer | |||
| battalion or brigade manpower and personnel staff officer (Marine Corps battalion or regiment) | |||
| First Sacral Vertebra | |||
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| first heart sound | |||
| S 1: 1 phrase in 1 subject |
| Abbreviation | 1 |