Columbia subject headings:
Harvard subject headings:
Bridges--Economic aspects--Argentina--Buenos Aires.
Bridges--Economic aspects--Uruguay--Colonia del Sacramento.
Bridges--Social aspects--Argentina--Buenos Aires.
Bridges--Social aspects--Uruguay--Colonia del Sacramento.
Princeton subject headings:
Argentina--Commerce--Uruguay.
Argentina--Relations--Uruguay.
Bridges--Argentina--Buenos Aires.
Bridges--Uruguay--Colonia.
Public works--Argentina--Buenos Aires.
Public works--Uruguay--Colonia.
Uruguay--Commerce--Argentina.
Uruguay--Relations--Argentina.