@article {30814,
	title = {Effect of sulphur dioxide on precipitation and on sulphur content and acidity of soils in Alberta, Canada},
	volume = {7},
	year = {1977},
	pages = {439-448},
	publisher = {Water, Air, \& Soil Pollution},
	author = {Nyborg, M. and Crepin, J. and Hocking, D. and Baker, J.}
}
