Columbia subject headings:
Harvard subject headings:
Barreto, Tobias, 1839-1889--Political and social views.
Romero, Sílvio, 1851-1914--Political and social views.
Princeton subject headings:
Barreto, Tobias, 1839-1889--Political and social views.
Romero, Sílvio, 1851-1914--Political and social views.
Utopias--History--19th century.