@book{22199,
	author = {Pennsylvania State University},
	title = {Guide to reaserch in air pollution},
	publisher = {Environmental Protection Agency, Office of Air Quality Planning and Standards ; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]},
	year = {1972.},
	address = {Research Triangle Park, N.C.},
	note = {Contract no.168-02-0077.}
}