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Ordovician period; Ordovician age (MichaelBurov); Ordovician time (MichaelBurov); the Ordovician (MichaelBurov); Ordovician (геол. MichaelBurov) | |||
Ordovician system | |||
the Ordovician (второй период палеозойской эры) | |||
Ordovician |
ордовик : 23 phrases in 4 subjects |
Geochronology | 4 |
Geology | 13 |
Makarov | 1 |
Stratigraphy | 5 |