@article {3512,
	title = {Observations of Fine and Coarse Particle Nitrate at Several Rural Locations in the United States},
	journal = {Atmospheric Environment},
	volume = {42},
	year = {2008},
	month = {April},
	pages = {2720-2732},
	keywords = {Acid rain, Air quality, Pollution},
	author = {Lee, Taehyoung and Yu, Xiao Ying and Ayres, Benjamin and Kreidenweis, Sonia M and Malm, William C and Collett, Jeffrey L}
}
@article {3513,
	title = {Semi-Continuous Measurement of PM2.5 Ionic Composition at Several Rural Locations in the United States},
	journal = {Atmospheric Environment},
	volume = {42},
	year = {2008},
	note = {Maps},
	month = {September},
	pages = {6655-6669},
	keywords = {Aerosol monitoring, Air quality, Pollution},
	author = {Lee, Taehyoung and Yu, Xiao Ying and Kreidenweis, Sonia M and Malm, William C and Collett, Jeffrey L}
}
