Columbia subject headings:
Architecture--Mathematics.
Architecture--Spain--Santander.
Santander (Spain)--Buildings, structures, etc.
Santander (Spain)--History.
Harvard subject headings:
Architecture--Mathematics
Architecture--Spain--Santander.
Santander (Spain)--Buildings, structures, etc.
Santander (Spain)--History.
Princeton subject headings:
Architecture--Mathematics.
Architecture--Spain--Santander.
Santander (Spain)--Buildings, structures, etc.
Santander (Spain)--History.