Columbia subject headings:
Catholic Church--Spain--History--19th century.
Papal nuncios--Spain--19th century.
Spain--Church history--19th century.
Harvard subject headings:
Catholic Church--Spain--History--19th century
Papal nuncios--Spain--19th century.
Spain--Church history--19th century.
Princeton subject headings:
Catholic Church--Foreign relations--Spain--History--19th century--Sources.
Catholic Church--Spain--Bishops--Correspondence.
Spain--Church history--19th century--Sources.
Spain--Foreign relations--Catholic Church--History--19th century--Sources.