Columbia subject headings:
Brazil--Boundaries--Congresses.
Brazil--Boundaries--Paraguay--Congresses.
Brazil--History--Congresses.
Harvard subject headings:
Brazil--Boundaries--Congresses.
Brazil--Boundaries--Paraguay--Congresses.
Brazil--History--Congresses.
Brazil--Relations--Paraguay--Congresses.
Mato Grosso do Sul (Brazil)--History--Congresses.
Paraguay--Relations--Brazil--Congresses.
Tri-Border Area (Argentina, Brazil, and Paraguay)--History--Congresses.
Princeton subject headings:
Brazil--Boundaries--Congresses.
Brazil--Boundaries--Paraguay--Congresses.
Brazil--History--Congresses.