00563nam a2200193Ia 4500008004100000020001500041082001800056100011100074245001600185260002800201300000800229650003400237650001800271653001500289653001000304653001700314700002100331700001700352170901s1973    xx            000 0 und d  a9022005526  a547.633bI-5P  aInternational Meeting on Humic Sustances Their Structure And Function in the Biosphere, NieuwersLuis, 1972 0aProceedings  aWageningenbPUDOCc1973  a368  aChemistry and allied sciences  aPure Sciences  aHumic acid  aHumus  aSoil biology  aGolterman, H. L.  aPovoledo, D.