00649naa a2200241 a 450000100080000000500110000800800410001910000170006024500590007726000090013665000170014565000130016265000140017565000190018965000150020865000230022365300230024670000180026970000170028770000180030470000250032277300600034717963561999-05-25       1986    bl ---       0--  u    #d1 aERTEL, J. R.  aDissolved humic substances of the Amazon river system.  c1986  aAmazon River  aAmazonia  alimnology  aorganic matter  aLimnologia  aMatéria Orgânica  aSubstancia quimica1 aHEDGES, J. I.1 aDEVOL, A. H.1 aRICHEY, J. E.1 aRIBEIRO, M. de N. G.  tLimnology and Oceanographygv.31, n.4, p.739-754, 1986.