Columbia subject headings:
Archivio vaticano--Catalogs.
Catholic Church--Foreign relations--Spain--History--19th century--Sources--Bibliography--Catalogs.
Catholic Church--Spain--Bishops--Correspondence--Bibliography--Catalogs.
Catholic Church. Apostolic Nunciature (Spain). Archivo--Catalogs.
Spain--Church history--19th century--Sources--Bibliography--Catalogs.
Spain--Foreign relations--Catholic Church--Sources--Bibliography--Catalogs.
Harvard subject headings:
Archivio vaticano--Catalogs.
Archivo vaticano--Catalogs.
Catholic Church--Foreign relations--Spain--History--19th century--Sources--Bibliography--Catalogs.
Catholic Church--Foreign relations--Spain--Sources--Bibliography--Catalogs.
Catholic Church--Spain--Bishops--Correspondence--Bibliography--Catalogs.
Catholic Church. Apostolic Nunciature (Spain). Archivo--Catalogs.
Spain--Church history--19th century--Sources--Bibliography--Catalogs.
Spain--Foreign relations--Catholic Church--Sources--Bibliography--Catalogs.
Spain--Relations--Catholic Church--Sources--Bibliography--Catalogs.
Princeton subject headings:
Archivio vaticano.
Bishops--Spain--Correspondence.
Catholic Church--Spain--History.