Columbia subject headings:
Harvard subject headings:
Air quality management--United States--Congresses.
Highway engineering--Environmental aspects--United States--Congresses.
Traffic noise--Environmental aspects--Ontario--Congresses.
Traffic noise--Environmental aspects--United States--Congresses.
Princeton subject headings:
Air quality management--United States--Congresses.
Highway engineering--Environmental aspects--United States--Congresses.
Traffic noise--Environmental aspects--Ontario--Congresses.
Traffic noise--Environmental aspects--United States--Congresses.