Overburden: differenze tra le versioni
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Riga 19:
*{{en}} Haering, K. C.; Daniels W. L. and Roberts J. A. (1993) "Changes in mine soil properties resulting from overburden weathering" ''Journal of environmental quality'' 22(1): pp. 194-200.
*{{en}} McFee, W.W.; Byrnes, W.R. and Stockton, J.G. (1981) "Characteristics of coal mine overburden important to plant growth" ''Journal of environmental quality'' 10(3): pp. 300-308.
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