Columbia subject headings:
Landscape architectural projects--Spain--Barcelona.
Landscape architecture--Spain--Barcelona.
Parc Natural de Collserola (Barcelona, Spain)
Parks--Spain--Barcelona.
Urban beautification--Spain--Barcelona.
Harvard subject headings:
Landscape architectural projects--Spain--Barcelona.
Parc Natural de Collserola (Barcelona, Spain)
Parks--Landscape architecture--Spain--Barcelona.
Parks--Spain--Barcelona--Designs and plans.
Urban beautification--Spain--Barcelona.
Princeton subject headings:
Landscape architectural projects--Spain--Barcelona.
Landscape architecture--Spain--Barcelona.
Parc Natural de Collserola (Barcelona, Spain)
Parks--Spain--Barcelona.
Urban beautification--Spain--Barcelona.