Columbia subject headings:
Cities and towns--Poland--Congresses.
Cities and towns--Research--Congresses.
Social integration--Poland--Congresses.
Sociology, Urban--Congresses.
Sociology, Urban--Poland--Congresses.
Harvard subject headings:
Cities and towns--Poland--Congresses.
Cities and towns--Research--Congresses.
Social integration--Poland--Congresses.
Sociology, Urban--Congresses.
Sociology, Urban--Poland--Congresses.
Princeton subject headings: