Columbia subject headings:
Agricultural innovations--Nigeria, Northern.
Agriculture--Economic aspects--Nigeria, Northern.
Farms, Small--Nigeria, Northern.
Harvard subject headings:
Agricultural innovations--Nigeria, Northern.
Agricultural innovations--Nigeria--Northern Nigeria.
Agricultural innovations--Nigeria.
Agriculture--Economic aspects--Nigeria, Northern.
Agriculture--Economic aspects--Nigeria--Northern Nigeria.
Farms, Small--Nigeria, Northern.
Farms, Small--Nigeria--Northern Nigeria.
Farms, Small--Nigeria.
Rural development--Nigeria
Princeton subject headings:
Agricultural innovations--Nigeria, Northern.
Agriculture--Economic aspects--Nigeria, Northern.
Farms, Small--Nigeria, Northern.