00723naa a2200253 a 450000100080000000500110000800800410001910000150006024500820007526000090015765300140016665300220018065300250020265300250022765300130025265300200026565300130028565300120029865300160031065300110032670000170033770000170035477300980037110829782012-01-17       1999    bl uuuu     u00u1 u    #d1 aHECK, R.J.  aIron oxides in plinthic soils on sedimentary deposots in Northeastern Brazil.  c1999  aalumínio  aCitrato dilionito  aDifração de raio-X  aFormação Itapecuru  aGoethita  aGrupo Barreiras  aHematita  aOxalato  aPlintossolo  aUstalf1 aMERMUT, A.R.1 aSANTOS, M.C.  tRevista Brasileira de Ciência do Solo, Viçosa, MGgv. 23, n. 3, p. 651-660, jul./set. 1999.