@article {4994, title = {Are Threatened High-Elevation Spruce-Fir Forests Impacted by Aluminum Toxicity and Calcium Loss?}, year = {2008}, month = {circa}, institution = {Michigan Technological University}, address = {Houghton, MI}, keywords = {Acid rain, Air particles -- Deposition, Air quality, Forests, Fraser fir, Red spruce, Soil acidity, Soils}, issn = {PMIS 110118}, url = {http://diglib.lib.utk.edu/dotsdata/Webster_AreThretenedHighElevationSpruceFirForestsImpactedByAluminumToxicityAndCalciumLoss_2008.pdf}, author = {Webster, Christopher R} }