Columbia subject headings:
Agriculture--Economic aspects--Nigeria, Northern.
Arid regions agriculture--Nigeria, Northern.
Desertification--Nigeria, Northern.
Droughts--Nigeria, Northern.
Famines--Nigeria, Northern.
Nigeria, Northern--Rural conditions.
Harvard subject headings:
Agriculture--Economic aspects--Nigeria, Northern.
Arid regions agriculture--Nigeria, Northern.
Desertification--Nigeria, Northern.
Droughts--Nigeria, Northern.
Famines--Nigeria, Northern.
Nigeria, Northern--Rural conditions.
Princeton subject headings:
Agriculture--Economic aspects--Nigeria, Northern.
Arid regions agriculture--Nigeria, Northern.
Desertification--Nigeria, Northern.
Droughts--Nigeria, Northern.
Famines--Nigeria, Northern.
Nigeria, Northern--Rural conditions.