Columbia subject headings:
Ballads, Catalan--History and criticism--Congresses.
Ballads, Galician--History and criticism--Congresses.
Ballads, Ladino--History and criticism--Congresses.
Ballads, Portuguese--History and criticism--Congresses.
Ballads, Spanish--History and criticism--Congresses.
Harvard subject headings:
Ballads, Catalan--History and criticism--Congresses.
Ballads, Galician--History and criticism--Congresses.
Ballads, Ladino--History and criticism--Congresses.
Ballads, Portuguese--History and criticism--Congresses.
Ballads, Spanish--History and criticism--Congresses.
Oral tradition--Congresses.
Princeton subject headings:
Ballads, Spanish--History and criticism--Congresses.
Oral tradition--Congresses.