Columbia subject headings:
Buenos Aires (Argentina)--Buildings, structures, etc.
Skyscrapers--Argentina--Buenos Aires--History--20th century.
Skyscrapers--Argentina--Buenos Aires--History--21st century.
Tall buildings--Argentina--Buenos Aires--History--20th century.
Harvard subject headings:
Architecture--Argentina--Buenos Aires--History.
Buenos Aires (Argentina)--Buildings, structures, etc.
Tall buildings--Argentina--Buenos Aires--History.
Princeton subject headings: