Columbia subject headings:
Agriculture--Environmental aspects--Andes.
Agriculture--Environmental aspects--Peru--Sierra.
Sustainable development--Andes.
Sustainable development--Peru--Sierra.
Harvard subject headings:
Agricultural ecology--Peru--Sierra.
Agricultural geography--Peru--Sierra.
Agriculture--Peru--Sierra.
Princeton subject headings:
Agricultural ecology--Peru--Sierra.
Agricultural geography--Peru--Sierra.
Agriculture--Peru--Sierra.