Columbia subject headings:
Architecture--Poland--Congresses.
Excavations (Archaeology)--Poland--Congresses.
Poland--Antiquities--Congresses.
Harvard subject headings:
Architecture, Medieval--Poland--Congresses.
Architecture, Romanesque--Poland--Congresses.
Church architecture--Poland--Congresses.
Excavations (Archaeology)--Poland--Congresses.
Princeton subject headings: