00506nam a2200181Ia 4500020001500000082002400015100001700039245005600056260003700112300001300149500000500162690000600167700000500173952010500178964001700283921000900300999001500309  a0485195461  a338.109861bOr77.UP  aOrtiz, S. R.  aUncertainities in peasant farmingba Colombian case  aNew YorkbHumanities Pressc1973  ax, 294p.  a  a   a  00104070aISIbISId1998-08-21l0o338.109861 Or77.UPpDP7586r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a5354  c5354d5354