Columbia subject headings:
Harvard subject headings:
Cities and towns--Austria--Lower Austria--Congresses.
Cities and towns--Croatia--Congresses.
Cities and towns--Pannonia--Congresses.
Cities and towns--Yugoslavia--Slovenia--Congresses.
Princeton subject headings:
Cities and towns--Austria--Lower Austria--Congresses.
Cities and towns--Croatia--Congresses.
Cities and towns--Pannonia--Congresses.
Cities and towns--Slovenia--Congresses.