Columbia subject headings:
Harvard subject headings:
Environmental protection--Patagonia (Argentina and Chile)
Hydroelectric power plants--Environmental aspects--Patagonia (Argentina and Chile)
Hydroelectric power plants--Patagonia (Argentina and Chile)--Environmental aspects.
Patagonia (Argentina and Chile)--Environmental conditions.
Princeton subject headings:
Environmental protection--Patagonia (Argentina and Chile).
Hydroelectric power plants--Environmental aspects--Patagonia (Argentina and Chile).