Columbia subject headings:
Harvard subject headings:
Railroads and state--Germany--Congresses.
Railroads--Economic aspects--Germany--Congresses.
Railroads--Germany--Management--Congresses.
Railroads--Privatization--Germany--Congresses.
Sustainable development--Germany--Congresses.
Princeton subject headings:
Railroads and state--Germany--Congresses.
Railroads--Economic aspects--Germany--Congresses.
Railroads--Germany--Management--Congresses.
Railroads--Privatization--Germany--Congresses.
Sustainable development--Germany--Congresses.