Columbia subject headings:
Harvard subject headings:
Architecture, Modern--19th century--Latvia--Rīga.
Architecture, Modern--20th century--Latvia--Rīga.
Art nouveau (Architecture)--Latvia--Rīga.
Princeton subject headings:
Architecture, Modern--Latvia--Rīga.
Architecture--Latvia--Rīga.
Art nouveau--Latvia--Rīga.
Rīga (Latvia)--Buildings, structures, etc.