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| Heliummethode f (определения возраста, der Altersbestimmung) | |||
| Heliummethode f (определения абсолютного возраста) | |||
| Heliummethode f | |||
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гелиевый метод : 4 phrases in 3 subjects |
| Astronomy | 2 |
| Geology | 1 |
| Nuclear and fusion power | 1 |
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