Columbia subject headings:
Chaco Boreal (Paraguay and Bolivia)
Chile--Neutrality.
Contraband of war.
Neutrality--Chile.
Harvard subject headings:
Chaco Boreal (Paraguay and Bolivia)
Contraband of war.
Neutrality--Chile.
Princeton subject headings:
Chaco Boreal (Paraguay and Bolivia)
Chile--Neutrality.
Contraband of war.