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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
Harwant, Singh (2012) The Physical Environment of Sarawak. UNIMAS Publisher, Kota Samarahan, Sarawak. ISBN 9789675527449.