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Soil solution chemistry and ion leaching in northern hardwood forests across an 800 km pollution gradient. Emerging Issues in Northern Hardwood Management: Air Pollution, Climate Change & Biodiversity. Miscellaneous Publication 91-1:38.. 1991.
Variation in forest soil properties along a Great Lakes air pollution gradient. Soil Science Society of America Journal. 55:1709-1715.. 1991.
Foliar sulfur and nitrogen along an 800-km pollution gradient. Canadian Journal of Forest Research. 22:1761-1769.. 1992.
Ion leaching in forest ecosystems along a Great Lakes air pollution gradient. Journal of Environmental Quality. 21(4):614-623.. 1992.
Sulfate adsorption and microbial immobilization in northern hardwood forests along an atmospheric deposition gradient. Canadian Journal of Forest Research. 22:1843-1850.. 1992.
Foliar nutrients in sugar maple forests along a regional pollution-climate gradient. Soil Science Society of America Journal. 57:1619-1628.. 1993.
Studying the effects of air pollution on forest along exposure gradients: experiences in the United States and opportunities for cooperation. Climate and Atmospheric Deposition Studies in Forests. :109-115.. 1994.
Sulfate adsorption in forest soils of the Great Lakes region. Soil Science Society of America Journal. 58:1546-1555.. 1994.
Temperature effects on kinetics of microbial respiration and net nitrogen and sulfur mineralization. Soil Science Society of America Journal. 59:233-240.. 1995.
Environmental stress effects on vigor, mortality, and growth in northern hardwood forests along a pollution-climate gradient. The Michigan Academician. 30:27-47.. 1998.
Chronic nitrate additions dramatically increase the export of carbon and nitrogen from northern hardwood ecosystems. Biogeochemistry. 68:179-197.. 2004.