Columbia subject headings:
Pérez Galdós, Benito, 1843-1920--Criticism and interpretation.
Harvard subject headings:
Pérez Galdós, Benito, 1843-1920--Criticism and interpretation.
Pérez Galdós, Benito, 1843-1920--Dramatic works.
Princeton subject headings:
Pérez Galdós, Benito, 1843-1920--Criticism and interpretation.