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cal BP (Radiocarbon dating [радиоуглеродный анализ]: cal BP – calibrated years before the present;
cal ka BP – calibrated thousand years before the present;
cal Ma BP – calibrated million years before the present;  thoughtco.com Dms64) | |||
| калиброванных лет до настоящего времени: 2 phrases in 1 subject |
| Research and development | 2 |