Columbia subject headings:
Argentina--Boundaries--Chile.
Beagle Channel (Argentina and Chile)
Chile--Boundaries--Argentina.
Harvard subject headings:
Argentina--Boundaries--Chile--Sources.
Beagle Channel (Argentina and Chile)--History--Sources.
Chile--Boundaries--Argentina--Sources.
Princeton subject headings:
Argentina--Boundaries--Chile.
Beagle Channel (Argentina and Chile)
Chile--Boundaries--Argentina.