Columbia subject headings:
Occitan language--History.
Provençal language--History.
Sociolinguistics.
Harvard subject headings:
Occitan language--History.
Provençal language--History.
Sociolinguistics.
Princeton subject headings:
Occitan language--History.
Occitan literature--History and criticism.
Provençal language--History.
Provençal literature--History and criticism.