@article {51981,
	title = {Depositional gradients of atmospheric pollutants in the Athabasca oil sands region Alberta Canada: An analysis of lichen tissue and lichen communities. Lichen Indicator Pilot Program 2002-2003},
	year = {2004},
	pages = {171 pages },
	address = {Fort McMurray, AB},
	keywords = {air emissions, biomonitoring, lichen, metals, sulphur and SO2},
	author = {Berryman, S. and Geiser, L. and Brenner, G.}
}
