Columbia subject headings:
Machado, Antonio, 1875-1939.
Unamuno, Miguel de, 1864-1936--Influence.
Harvard subject headings:
Machado, Antonio, 1875-1939.
Unamuno, Miguel de, 1864-1936--Influence--Machado y Ruiz.
Princeton subject headings:
Machado, Antonio, 1875-1939.
Unamuno, Miguel de, 1864-1936--Influence--Machado y Ruiz.