Columbia subject headings:
Historic buildings--Spain--Zaragoza.
Public buildings--Spain--Zaragoza--History.
Zaragoza (Spain)--Buildings, structures, etc.
Harvard subject headings:
Historic buildings--Spain--Zaragoza.
Public buildings--Spain--Zaragoza--History.
Zaragoza (Spain)--Buildings, structures, etc.
Princeton subject headings:
Historic buildings--Spain--Zaragoza.
Public buildings--Spain--Zaragoza--History.
Zaragoza (Spain)--Buildings, structures, etc.