Columbia subject headings:
Bell towers--Spain--Burgos (Province)--History--16th century.
Towers--Spain--Burgos (Province)--History--16th century.
Harvard subject headings:
Bell towers--Spain--Burgos--History--16th century.
Towers--Spain--Burgos--History--16th century.
Princeton subject headings:
Bell towers--Spain--Burgos (Province)--History--16th century.
Towers--Spain--Burgos (Province)--History--16th century.