Columbia subject headings:
Harvard subject headings:
Bochum (Germany)--Economic conditions--Congresses.
Bochum (Germany)--Social conditions--Congresses.
Cities and towns--Germany--Bochum--Congresses.
Municipal corporations--Germany--Bochum--Congresses.
Municipal government--Germany--Bochum--History--Congresses.
Urban policy--Germany--Bochum--Congresses.
Princeton subject headings:
Bochum (Germany)--Economic conditions--Congresses.
Bochum (Germany)--Social conditions--Congresses.
Cities and towns--Germany--Bochum--Congresses.
Municipal corporations--Germany--Bochum--Congresses.
Municipal government--Germany--Bochum--History--Congresses.
Urban policy--Germany--Bochum--Congresses.