"E.H. Pechan & Associates." . . . . "United States. Environmental Protection Agency. Office of Air Quality Planning and Standards. Emission Factors and Inventory Group." . . . . "1990 OTC NOx baseline emission inventory"@en . "1990 Ozone Transport Commission (OTC) oxide of nitrogen (NOx) baseline emission inventory"@en . . . . . . . . . . . . . . .