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."
Interactive Effects of Natural and Anthropogenic Factors on Growth and Physiology of Southern Red Spruce In US/FRG Research Symposium: Effects of Atmospheric Pollutants on the Spruce-Fir Forests of the Eastern United States and the Federal Republic of Germany: October 19-23, 1987, Edited by Gerard Hertel. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1988.
Interactive Effects of Natural and Anthropogenic Factors on Growth and Physiology of Southern Red Spruce. Environmental Sciences Division, Oak Ridge National Labratory and Phyton Technologies, Oak Ridge, Tenn., 1987.