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Seasonal variation in nitrate reductase activity in needles of high-elevation red spruce trees." Canadian Journal of Forest Research 22, no. 3 (1992): 375-380.
"Increased Dark Respiration and Calcium Deficiency of Red Spruce in Relation to Acidic Deposition at High-elevation Southern Appalachian Mountain Sites." Canadian Journal of Forest Research 21 (1991): 1234-1244.
"Growth and Physiological Changes in Red Spruce Saplings Associated with Acidic Deposition at High Elevations in the Southern Appalachians, USA." Forest Ecology and Management 51, no. 1-3 (1992): 43-51.
"Acid Deposition Alters Red Spruce Physiology: Laboratory Studies Support Field Observations." Canadian Journal of Forest Research 23, no. 3 (1993): 380-386.
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