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  1. 1
    Published 1984
    Tallinn [Estonia] : Academy of Sciences of the Estonian SSR, c1984.
    70 p. : ill. ; 20 cm.
  2. 2
    Published 1984
    [Yerevan] : Dept. of Geology of the Armenian SSR, [1984]
    97 p., [1] leaf of plates : ill. ; 22 cm.

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