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1. Trend Analysis of the Use of Natural Resources in the Construction Industry by Perera, H.D.B.S. Publication: Sri Lanka, The Department of National Planning, 2002 . vi, 54p. 24cm. Date: 2002 Availability: Items available: Reference (1),

2. Procedurws for Economic Valuation of Resources and Accounting of Oil Spill Damages by Barton, David N. Publication: Sri Lanka, Marine Pollution Authority, 2003 . 149p. 28cm Date: 2003 Availability: No items available:

3. A Case Study in the Kala Oya Basin Sri Lanka: Multiple Benefits of Small Irrigation Tanks and Their Economic Value - Occasional Papers of IUCN Sri Lanka No. 7, February 2005 by Perera, H.D.B.S. Publication: Colombo, IUCN Sri Lanka, 2005 . iv, 34p. 30cm. Date: 2005 Availability: No items available:

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