Columbia subject headings:
Barcelona (Spain)--Pictorial works.
Gaudí, Antoni, 1852-1926.
Postcards--Catalogs.
Harvard subject headings:
Barcelona (Spain)--Pictorial works.
Gaudí, Antoni, 1852-1926
Postcards--Catalogs
Princeton subject headings:
Barcelona (Spain)--Buildings, structures, etc.
Gaudí, Antoni, 1852-1926.
Postcards--Spain--Barcelona.