Transportation air quality :
selected facts and figures.
APA Citation
United States. Federal Highway Administration. (1999). Transportation air quality: selected facts and figures. [Washington, D.C.?]: U.S. Dept. of Transportation, Federal Highway Administration.
MLA Citation
United States. Federal Highway Administration. Transportation Air Quality: Selected Facts And Figures. [Washington, D.C.?]: U.S. Dept. of Transportation, Federal Highway Administration, 1999.
Warning: These citations may not always be complete (especially for serials).