Columbia subject headings:
Gaulish language--History.
Romance languages--History.
Romance-language literature--History and criticism.
Harvard subject headings:
Gaulish language--History.
Romance languages--History.
Romance-language literature--History and criticism.
Princeton subject headings:
French language--Vocabulary--History.
French philology.
Gallo-Italian dialects--History.
Occitan language--History.
Romance philology.
Romance-language literature--History and criticism.