Columbia subject headings:
Harvard subject headings:
Ecology--Argentina--Río Negro.
Ecology--Argentina--Ñirihuau.
Environmental protection--Argentina--Río Negro.
Natural history--Argentina--Ñirihuau.
Natural resources--Argentina--Ñirihuau.
Princeton subject headings:
Ecology--Argentina--Ñirihuau.
Natural history--Argentina--Ñirihuau.
Natural resources--Argentina--Ñirihuau.