Crawford, Eric W.  <br/><br/>
A programming-simulation study of constraints affecting teh long-run income-earning ability of traditional dryland farming systems in Northern Nigeria / 
Eric C. Crawford 
 - 4 microfiches ;  11 x 15 cm. 
<br/><br/>Thesis (Ph.D.)-Cornell University, 1980 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Farms, Small--Nigeria, Northern.<br/>Farm income--Nigeria, Northern.<br/>Dry farming--Nigeria, Northern.