Columbia subject headings:
Harvard subject headings:
Andes--Pictorial works.
Hydrology--Peru--Pictorial works.
Natural history--Peru--Pictorial works.
Peru--Description and travel
Peru--Pictorial works
Princeton subject headings:
Andes Region--Description and travel.
Andes Region--Pictorial works.
Peru--Description and travel.
Peru--Pictorial works.
Rivers--Peru.