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041 _aENG
082 _a636.08006
_bDER
100 _aN. De Ridder
245 0 _aModelling of extensive livestock production systems
260 _aEthiopia
_bInternational Livestock Centre for Africa
_c1986
300 _a349p
546 _aENGLISH
700 _a H. Van Keulen N. G. Seligman P.J.H. Neate
942 _cBK
999 _c31506
_d31506