00625naa a2200241 a 450000100080000000500110000800800410001910000180006024500680007826000090014665000140015565000120016965000160018165000090019765300080020665300090021465300230022365300300024670000190027670000180029570000180031377300520033116065331995-06-27       1942    bl ---       0--  u    #d1 aBURRIS, R. H.  aStudies of biological nitrogen fixation with isotopic nitrogen.  c1942  aBactéria  aMétodo  aNitrogênio  aSolo  a15N  a15N2  aFIXACAO DE N2 SOLO  aFIXACAO DE N2 SOLO/PLANTA1 aEPPLING, F. J.1 aWAHLIN, H. B.1 aWILSON, P. W.  tSoil Sci. Soc. Am. Proc.gv.7, p.258-262, 1942.