@article {6076,
	title = {Trace Metal Uptake and Accumulation in Trees as Affected by Environmental Pollution},
	year = {Undated},
	institution = {Oak Ridge National Laboratory, National Park Service, U. S. Department of the Interior},
	address = {Oak Ridge, TN},
	keywords = {Forests, Pollution, Sediments -- Heavy metals},
	issn = {Environmental Sciences Division, Publication 2571},
	author = {Baes, Charles F and McLaughlin, Samuel B}
}
@article {4986,
	title = {Seasonal variation in nitrate reductase activity in needles of high-elevation red spruce trees},
	journal = {Canadian Journal of Forest Research},
	volume = {22},
	year = {1992},
	note = {Tables},
	pages = {375-380},
	publisher = {NRC Research Press},
	address = {Ottawa, Ontario, Canada},
	keywords = {Pollution, Red spruce, Soils, Spruce-Fir forests},
	author = {Tjoelker, Mark G and McLaughlin, Samuel B and DiCosty, R. J and Lindberg, Steven E and Norby, R. J}
}
@article {6111,
	title = {Effects of Acidic Precipitation on the Soil Chemistry and Bioavailability of Aluminum, Manganese, and Copper},
	year = {1990},
	month = {December },
	institution = {Oak Ridge National Laboratory},
	address = {Oak Ridge, TN},
	keywords = {Acid rain, Air particles -- Deposition -- Heavy metals, Forests, Fraser fir, Pollution, Red spruce, Soil acidity},
	issn = {Environmental Sciences Division Publication No. 3507; ORNL//TM-11569},
	author = {Stam, Alan Christie and McLaughlin, Samuel B and McCormick, J. F}
}
@article {4667,
	title = {Trace Elements in Tree Rings: Evidence of Recent and Historical Air Pollution},
	journal = {Science},
	volume = {224},
	year = {1984},
	month = {May},
	pages = {494-497},
	keywords = {Air particles -- Deposition -- Heavy metals, Flora, Pollution, Trees, Trees -- Growth},
	author = {Baes, Charles F and McLaughlin, Samuel B}
}
