Columbia subject headings:
Cultural property--Protection--Peru--Machu Picchu Site.
Environmental protection--Peru--Machu Picchu Site.
Machu Picchu Site (Peru)--Environmental conditions.
Santuario Histórico de Machu Picchu (Peru)
Harvard subject headings:
Cultural property--Protection--Peru--Machu Picchu Site.
Incas--Antiquities
Machu Picchu Site (Peru)
Peru--Antiquities.
Santuario Histórico de Machu Picchu (Peru)
Princeton subject headings:
Cultural property--Protection--Peru--Machu Picchu Site.
Machu Picchu Site (Peru)
Santuario Histórico de Machu Picchu (Peru)