Columbia subject headings:
Farm management--Nigeria--Mathematical models.
Farms, Small--Nigeria--Mathematical models.
Harvard subject headings:
Agriculture--Economic aspects--Nigeria, Northern--Mathematical models.
Farm income--Nigeria, Northern--Mathematical models.
Farms, Small--Nigeria, Northern--Mathematical models.
Princeton subject headings:
Agriculture--Economic aspects--Nigeria, Northern--Mathematical models.
Farm income--Nigeria, Northern--Mathematical models.
Farms, Small--Nigeria, Northern--Mathematical models.