@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 {3595,
	title = {Two Hundred Year Variation of Southern Red Spruce Radial Growth as Estimated by Spectral Analysis: Comment},
	journal = {Canadian Journal of Forest Research},
	volume = {24},
	year = {1994},
	month = {November},
	pages = {2299-2304},
	keywords = {Red spruce, Trees -- Growth},
	author = {McLaughlin, Samuel B and Blasing, T. J and Downing, D. J}
}
@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}
}
