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  1. 1
    by Peiris, William
    Published 1976
    [Maharagama : Peiris, pref. 1976]
    1 online resource (64 p., [3] leaves of plates) : ill.
    Center for Research Libraries
    Online Resource
  2. 2
    by Herath, J. W.
    Published 1975
    Colombo : Geological Survey Dept., Ministry of Industries and Scientific Affairs, Republic of Sri Lanka (Ceylon), 1975.
    1 online resource (iv, 72 p.) : maps.
    Center for Research Libraries
    Online Resource
  3. 3
    Ratmalana : Sri Lanka Sisyopakara Samitiya, 1976.
    1 online resource (xxi, 144 p., [14] leaves of plates) : ill.
    Center for Research Libraries
    Online Resource

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