000			00311nam a22001097a 4500
008			150902b xxu||||| |||| 00| 0 eng d
020			_a07313438
082			_a631 CRA
100			_aCRAWFORD, ERIC W.
245			_aA SIMULATION STUDY OF CONSTRAINTS ON TRADITIONAL FARMING SYSTEMS IN NORTHERN NIGERIA
260			_c1982
999			_c1986 _d1986