A programming-simulation study of constraints affecting teh long-run income-earning ability of traditional dryland farming systems in Northern Nigeria - Crawford, Eric W. (Eric Winthrop) (Ann Arbor, Mich. : University Microfilms International, 1980)
Thesis (Ph.D.)-Cornell University, 1980
Keywords: Farms, Small -- Nigeria, Northern; Farm income -- Nigeria, Northern; Dry farming -- Nigeria, Northern