Columbia subject headings:
Architecture--Finland--Helsinki--Guidebooks.
Helsinki (Finland)--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Architecture--Finland--Helsinki--Guidebooks.
Helsinki (Finland)--Buildings, structures, etc.--Guidebooks.
Princeton subject headings:
Architecture--Finland--Helsinki--Guidebooks.
Helsinki (Finland)--Buildings, structures, etc.--Guidebooks.