00660nam a2200169 a 450000100080000000500110000800800410001910000190006024501110007926001950019065000230038565000100040870000180041870000190043670000150045570000200047021773452025-07-16       1988    bl uuuu     u00u1 u    #d1 aJOHNSON, D. E.  aAn economic model of sheep production in the central Tunisian mixed farming system.h[electronic resource]  aIn: INTERNATIONAL RANGELAND DEVELOPMENT SYMPOSIUM ON THE INTEGRATION OF RANGE MANAGEMENT IN MIXED AGRICULTURAL SYSTEMS, 1988, Potlach. Proceedings. Potlach, 1988. p. 127. Abstract 328.c1988  aBioeconomic models  aSheep1 aBORMAN, M. M.1 aBEN ALI, M. N.1 aLARIBE, M.1 aTIEDEMAN, J. A.