Columbia subject headings:
Bolivia--Boundaries--Paraguay.
Chaco Boreal (Paraguay and Bolivia)
Paraguay--Boundaries--Bolivia.
Harvard subject headings:
Bolivia--Boundaries--Paraguay.
Chaco Boreal (Paraguay and Bolivia)
Paraguay--Boundaries--Bolivia.
Princeton subject headings:
Bolivia--Boundaries--Paraguay.
Chaco Boreal (Paraguay and Bolivia)
Paraguay--Boundaries--Bolivia.