Columbia subject headings:
Harvard subject headings:
Architecture--Europe
Archives--Europe--Directories.
Capitals (Cities)
Capitals (Cities)--Europe--History--Archival resources.
Capitals (Cities)--Europe--History--Sources.
Cities and towns--Europe--History--Archival resources.
Cities and towns--Europe--History--Sources.
Cities and towns--Europe.
Princeton subject headings:
Capitals (Cities)
Cities and towns--Europe--History--Sources.