@article {3758,
	title = {Investigation of Acid Deposition Effects on Southern Appalachian Red Spruce (Picea Rubens) by Determination of Calcium, Magnesium, and Aluminum in Foliage and Surrounding Soil Using Icp-Oes},
	journal = {Instrumentation Science \& Technology},
	volume = {38},
	year = {2010},
	pages = {341-358},
	keywords = {Air particles -- Deposition -- Heavy metals, Red spruce, Trees -- Decay},
	author = {Rosenberg, Matthew B and Butcher, David J}
}
@article {2982,
	title = {Characterization of the Health of Southern Appalachian Red Spruce (Piceae rubens) Through Determination of Calcium, Magnesium, and Aluminum Concentrations in Foliage and Soil},
	journal = {Microchemical Journal},
	volume = {87},
	year = {2007},
	month = {December},
	pages = {170-174},
	keywords = {Acid rain, Air particles -- Deposition -- Heavy metals, Red spruce, Soils},
	author = {Bintz, Wesley W and Butcher, David J}
}
