@mastersthesis {11844,
	title = {The Interrelationship of Visibility Degradation, Ozone, and Sulfur Dioxide in National Park Areas and their Spatial-temporal Distribution Patterns},
	volume = {Master of Science},
	year = {1979},
	pages = {226},
	school = {Virginia Polytechnic Institute and State University},
	keywords = {Air quality, Ozone},
	author = {L{\"u}bkert, Barbara}
}
