@inbook {188, title = {Acid rain since 1985 - times are changing}, booktitle = {Acid deposition: its nature and impacts}, series = {Proceedings of the Royal Society of Edinburgh}, volume = {97}, year = {1991}, pages = {1-15}, author = {Brydges, T.G. and Wilson, R.B.}, editor = {Last, F.T. and Watling, R.} }