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2. Gurdeep Singh, Mine water quality deterioration due to acid mine drainage, International Journal of Mine water (under publication).
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4. Standard Methods for the Examination of water and waste water, 13th Edition, 1971, American Public Health Association Washington, D.C.
5. Gurdeep Singh, A Survey of corrosivity of underground mine waters from Indian coal mines. International Journal of Mine Water 5(1), 21–32, 1986.