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силурийский периодstresses
geochron. Silurian (MichaelBurov); Silurian period (MichaelBurov)
geol. Silur (MichaelBurov); Silurian period; Silurian (the Silurian)
Makarov., geol. the Silurian
силурийский период: 2 phrases in 2 subjects
Geology1
Oceanography & oceanology1