000			00490nam a2200145Ia 4500
008			140224s9999 xx 000 0 und d
082			_a581.133.11:631.1(669) 1975.10 (082.2) L7
100			_aAyanaba, A.,ed.
245			_aBiological nitrogen fixation in farming systems of the tropics.
260			_aChichester _bJohn Wiley & Sons _c1977
300			_axi,377p.
600			_aDart, P.J., jt. ed.
600			_aEdited by A.Ayanaba and P.J.Dart.
650			_aNitrogen fixation,Farming systems
999			_c97473 _d97473