Columbia subject headings:
Architecture--Belgium--Liège (Province)--History--19th century--Guidebooks.
Architecture--Belgium--Liège (Province)--History--20th century--Guidebooks.
Art nouveau (Architecture)--Belgium--Liège (Province)--Guidebooks.
Decoration and ornament, Architectural--Belgium--Liège (Province)--Guidebooks.
Decoration and ornament--Belgium--Liège (Province)--Art nouveau--Guidebooks.
Harvard subject headings:
Architecture--Belgium--Liège--19th century.
Architecture--Belgium--Liège--20th century.
Art nouveau (Architecture)--Belgium--Liège.
Princeton subject headings:
Architecture--Belgium--Liège (Province)--19th century--Guidebooks.
Architecture--Belgium--Liège (Province)--20th century--Guidebooks.
Art nouveau (Architecture)--Belgium--Liège (Province)--Guidebooks.
Decoration and ornament, Architectural--Belgium--Liège (Province)--Guidebooks.
Decoration and ornament--Belgium--Liège (Province)--Art nouveau--Guidebooks.
Guidebooks.