00569nam a2200217 a 450000100080000000500110000800800410001910000150006024500220007526000320009730000100012949000580013965000270019765000240022465000120024865000190026065000250027965000180030465000100032270000190033210000732014-02-22       1959    bl uuuu     u00u1 u    #d1 aKOHNKE, H.  aSoil conservation  aNew York: McGraw-Hillc1959  a298p.  aMcGraw-Hill Publications in the Agricultural Sciences  aCONSERVACION DE SUELOS  aDETERIORO DEL SUELO  aEROSION  aEROSION EOLICA  aFERTILIDAD DEL SUELO  aPLANIFICACION  aSUELO1 aBERTRAND, A.R.