Columbia subject headings:
Pastoral systems--Andes Region.
Pastoral systems--South America.
Wetlands--Andes Region.
Wetlands--South America.
Harvard subject headings:
Pastoral systems--Andes Region.
Pastoral systems--South America.
Wetlands--Andes Region.
Wetlands--South America.
Princeton subject headings:
Pastoral systems--Andes Region.
Pastoral systems--South America.
Wetlands--Andes Region.
Wetlands--South America.