Columbia subject headings:
Biodiversity--Pictorial works.
Biodiversity.
Endangered ecosystems--Pictorial works.
Endangered ecosystems.
Harvard subject headings:
Biodiversity
Biodiversity conservation
Biodiversity--Pictorial works.
Endangered ecosystems
Endangered ecosystems--Pictorial works.
Princeton subject headings:
Biodiversity conservation.
Biodiversity--Pictorial works.
Biodiversity.
Endangered ecosystems--Pictorial works.
Endangered ecosystems.