Columbia subject headings:
Sociolinguistics--Argentina, Northwest.
Spanish language--Argentina, Northwest--History--Sources.
Harvard subject headings:
Sociolinguistics--Argentina, Northwest.
Spanish language--Argentina, Northwest--History--Sources.
Princeton subject headings:
Argentina, Northeast--Social conditions--History--Sources.
Language spread--Argentina, Northeast--History--Sources.
Spanish language--Argentina, Northeast--History--Sources.
Spanish language--Classical period, 1500-1700--Sources.