00330nam a22001217a 4500040000700000082000800007100001500015245012400030260002300154300000900177942000700186999001500193  cSK  a636  aPUTT S.N.H  aVeterinary epidemiology and economies in africa a manual for use in the design and appraisal of livestock health policy  aENGLANDbPUTc1987  a94p.  cEK  c8948d8948