Columbia subject headings:
Automobiles--Environmental aspects--Europe--Congresses.
Automobiles--Social aspects--Europe--Congresses.
Transportation, Automotive--Environmental aspects--Europe--Congresses.
Harvard subject headings:
Automobiles--Environmental aspects--Europe--Congresses.
Automobiles--Social aspects--Europe--Congresses.
Transportation, Automotive--Environmental aspects--Europe--Congresses.
Urban transportation--Environmental aspects--Europe--Congresses.
Princeton subject headings:
Automobiles--Environmental aspects--Europe--Congresses.
Transportation, Automotive--Environmental aspects--Europe--Congresses.
Urban transportation--France--Congresses.
Urban transportation--Germany--Congresses.
Urban transportation--Great Britain--Congresses.