Columbia subject headings:
Harvard subject headings:
Desert animals--Sahel--Identification.
Desert biology--Sahel.
Desert ecology--Sahel.
Desert plants--Sahel--Identification.
Freshwater animals--Sahel--Identification.
Princeton subject headings:
Animals--Niger--Identification.
Desert animals--Sahel--Identification.
Desert biology--Sahel.
Desert ecology--Sahel.
Desert plants--Sahel--Identification.
Freshwater animals--Sahel--Identification.
Plants--Niger--Identification.