J. Gregg

Physiological and developmental effects of ozone on cottonwood growth in urban and rural sites in the vicinity of New York City
Gregg, J. W., Clive G. Jones, and T.E. Dawson. 2006. “Physiological and Developmental Effects of Ozone on Cottonwood Growth in Urban and Rural Sites in the Vicinity of New York City”. Ecol. Appl. 16: 2368-81. http://www.caryinstitute.org/reprints/Gregg_et_al_Physiological_Ecol_Appl_16-6-2368-2381.pdf.
Urbanization effects on tree growth in the vicinity of New York City
Gregg, J. W., Clive G. Jones, and T.E. Dawson. 2003. “Urbanization Effects on Tree Growth in the Vicinity of New York City”. Nature 424: 183-87. http://www.caryinstitute.org/reprints/Urbanization_Nature_424_183-187.pdf.
The effect of urban compared to rural environments on plant growth in the vicinity of New York City: the net response and the relative importance of the different pollutants
Gregg, J. W. 1999. “The Effect of Urban Compared to Rural Environments on Plant Growth in the Vicinity of New York City: The Net Response and the Relative Importance of the Different Pollutants”. Ithaca, New York, Cornell University.