Columbia subject headings:
Cotton trade--Nigeria, Northern--History.
Hausa (African people)
Nigeria, Northern--Economic conditions.
Peanuts--Nigeria, Northern--History.
Harvard subject headings:
Cotton trade--Nigeria, Northern--History.
Hausa (African people).
Nigeria, Northern--Economic conditions.
Nigeria--Commerce--History.
Peanuts--Nigeria, Northern--History.
Peanuts--Nigeria--Marketing--History.
Princeton subject headings:
Cotton trade--Nigeria, Northern--History.
Hausa (African people)
Nigeria, Northern--Economic conditions.
Peanuts--Nigeria, Northern--History.