Columbia subject headings:
Sustainable architecture--Spain--Zaragoza--Designs and plans.
Sustainable architecture--Spain--Zaragoza.
Zaragoza (Spain)--Buildings, structures, etc.
Harvard subject headings:
Exhibition buildings--Spain--Zaragoza--Design and construction.
Higueras Cárdenas, Ricardo.
Sustainable buildings--Spain--Zaragoza.
Princeton subject headings: