Columbia subject headings:
Marxian economics.
Socialism--Spain.
Unamuno, Miguel de, 1864-1936--Political and social views.
Harvard subject headings:
Marxian economics.
Socialism--Spain
Unamuno, Miguel de, 1864-1936--Political and social views.
Princeton subject headings:
Marxian economics.
Socialism--Spain.
Unamuno, Miguel de, 1864-1936--Political and social views.