Columbia subject headings:
Architecture--Scandinavia--History--18th century--Congresses.
Historic buildings--Scandinavia--18th century--Congresses.
Mansions--Scandinavia--History--18th century--Congresses.
Palaces--Scandinavia--History--18th century--Congresses.
Harvard subject headings:
Princeton subject headings:
Manors--Denmark--History--18th century--Congresses.
Manors--Norway--History--18th century--Congresses.
Manors--Sweden--History--18th century--Congresses.
Palaces--Denmark--History--18th century--Congresses.
Palaces--Norway--History--18th century--Congresses.
Palaces--Sweden--History--18th century--Congresses.