Columbia subject headings:
Harvard subject headings:
Bridges--Argentina--Congresses.
Bridges--Uruguay--Congresses.
Transit, International--Argentina--Congresses.
Transit, International--Uruguay--Congresses.
Princeton subject headings:
Argentina--Relations--Uruguay--Congresses.
Bridges--Argentina--Congresses.
Bridges--Uruguay--Congresses.
Uruguay--Relations--Argentina--Congresses.