00322nam a2200133 a 450000100080000000500110000800800410001910000190006024500260007926000300010530000100013565300250014570000180017010213392002-05-09       1971    bl uuuu      00u1 u    #d1 aSNEDECOR, G.W.  aMetodos estadisticos.  aMexico: Continentalc1971  a703p.  aEstatistica agricola1 aCOCHRAN, W.G.