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| геологическая система (MichaelBurov) | |||
| периодичность геологических процессов и явлений | |||
| геологический период | |||
| период (("период" в геологии) A geologic system, or simply system, is a chronostratigraphic unit of geologic time more commonly referred to as a "period" or "geologic period" MichaelBurov) | |||
| geological period: 1 phrase in 1 subject |
| Oilfields | 1 |