Columbia subject headings:
Harvard subject headings:
Menéndez Pidal, Ramón, 1869-1968. Orígenes del español
Spanish language--Grammar, Historical
Spanish language--History
Princeton subject headings:
Linguistic change.
Menéndez Pidal, Ramón, 1869-1968. Orígenes del español.
Spanish language--Grammar, Historical.
Spanish language--History.