Columbia subject headings:
Bécquer, Gustavo Adolfo, 1836-1870--Criticism and interpretation.
Existentialism in literature.
Existentialism.
Unamuno, Miguel de, 1864-1936--Criticism and interpretation.
Harvard subject headings:
Princeton subject headings:
Bécquer, Gustavo Adolfo, 1836-1870--Criticism and interpretation.
Unamuno, Miguel de, 1864-1936--Criticism and interpretation.