Columbia subject headings:
Exhibition buildings--Spain--Zaragoza--History--21st century--Exhibitions.
Expo (International Exhibitions Bureau) (2008 : Zaragoza, Spain)--Buildings--Exhibitions.
Zaragoza (Spain)--Buildings, structures, etc.--Exhibitions.
Harvard subject headings:
Sustainable architecture--Spain--Zaragoza--Exhibitions.
Urban renewal--Environmental aspects--Spain--Zaragoza--Exhibitions.
Water and architecture--Design and construction--Exhibitions.
Princeton subject headings: