The influence of acidic mine and spoil drainage on water quality in the mid-Wales area / by R. Fuge, I.M.S. Laidlaw, W.T. Perkins and K.P. Rogers. Northwood, Middx, England : Science and Technology Letters ; Wilmington, DE : Science Reviews Inc, 1991. IN: Environmental Geochemistry and Health ; v. 13, n. 2, June 1991, p. 70-75.