@article {30006,
	title = {Epiphytic lichens as biological indicators of air pollution in westcentral Alberta : a progress report. In : Proceedings of Alberta Sulphur Gas Research Workshop II, held at Environmental Sciences Centre, Kananaskis, Alberta, 16-17 January 1975, edited by},
	year = {1975},
	pages = {143-152},
	institution = {Alberta Environment, Research Secretariat and University of Calgary, Environmental Sciences Centre},
	author = {Case, James W.}
}
