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Harwant, Singh (2012) The Physical Environment of Sarawak. UNIMAS Publisher, Kota Samarahan, Sarawak. ISBN 9789675527449.
Harwant, Singh and Prabir, Kumar Kolay (2007) Analysis of Coal Ash for Trace Elements and their Geo-environmental Implications. Water, Air, and Soil Pollution, 198 (1). pp. 87-94. ISSN 0049-6979