Columbia subject headings:
Harvard subject headings:
Bilingualism--America--History.
Bilingualism--Spain--History.
Sociolinguistics.
Spanish language--Dialects--America--History.
Spanish language--Dialects--Spain--History.
Princeton subject headings:
Bilingualism--America--History.
Bilingualism--Spain--History.
Sociolinguistics.
Spanish language--Dialects--America--History.
Spanish language--Dialects--Spain--History.