Columbia subject headings:
Graffiti--Competitions--Spain--Madrid.
Picasso, Pablo, 1881-1973. Guernica.
Street art--Competitions--Spain--Madrid.
Harvard subject headings:
Mural painting and decoration, Spanish--21st century--Exhibitions.
Mural painting and decoration--Competitions--Spain--Madrid--Exhibitions.
Street art--Spain--History--21st century--Exhibitions.
Princeton subject headings:
Mural painting and decoration, Spanish--21st century--Exhibitions.
Mural painting and decoration--Competitions--Spain--Madrid--Exhibitions.
Street art--Spain--History--21st century--Exhibitions.