Columbia subject headings:
Harvard subject headings:
Argentina--History--20th century.
Chaco (Argentina)--Ethnic relations.
Formosa (Argentina : Province)--Ethnic relations.
Indians of South America--Argentina--Chaco.
Indians of South America--Argentina--Formosa.
Princeton subject headings:
Indians of South America--Argentina--Chaco--Government relations.
Indians of South America--Argentina--Chaco--Missions.
Indians of South America--Argentina--Chaco--Social conditions.