Columbia subject headings:
Anarchism--Spain.
Barrett, Rafael, 1876-1910--Political and social views.
Harvard subject headings:
Anarchism--Spain
Anarchism--Spain--History--19th century.
Barrett, Rafael, -1910--Political and social views.
Barrett, Rafael, 1876-1910--Political and social views.
Princeton subject headings:
Anarchism--Spain.
Barrett, Rafael, 1876-1910--Political and social views.