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McLaughlin, Samuel B., and Mark G. Tjoelker. "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.

Tjoelker, Mark G., Samuel B. McLaughlin, R. J. DiCosty, Steven E. Lindberg, and R. J. Norby. "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.

McLaughlin, Samuel B., Christian P. Andersen, Paul J. Hanson, Mark G. Tjoelker, and Kelly W. Roy. "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.