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  1. 1
    [Colombo] National Science Council.
    ill. 25 cm.
  2. 2
    Published 1970
    Koḷamba : [Kālaguna Vidyā Depārtamēntuva], 1970-1972.
    2 v. ; 25 cm.
  3. 3
    [Colombo, Dept. of Geological Survey]
    v. 24 cm.
  4. 4
  5. 5
  6. 6
    [Koḷamba] : Sabhāva,
    v. ; 28 cm.

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