Columbia subject headings:
Harvard subject headings:
Natural history--Botswana--Okavango River Delta Region--Pictorial works.
Natural history--Botswana--Okavango River Delta Region.
Okavango River Delta Region (Botswana)
Okavango River Delta Region (Botswana)--Pictorial works.
Princeton subject headings:
Chobe River Valley.
Natural history--Botswana--Okavango River Delta.
Natural history--Botswana.
Okavango River Delta (Botswana)