@article {3670,
	title = {An Analysis of the Yearly Changes in Sulfur Concentrations at Various National Parks in the United States, 1980-1996},
	journal = {Journal of the Air \& Waste Management Association},
	volume = {50},
	year = {2000},
	month = {May},
	pages = {790-801},
	keywords = {Aerosol monitoring, Air pollution, Conservation -- Government regulations},
	author = {Patterson, Paul and Iyer, Hari and Sisler, James and Malm, William C}
}
