000			00429nam a2200169Ia 4500
020			_a0471994995
082			_a631.9/AYA
100			_aAyanaba, A., ed.
245			_aBiological nitrogen fixation in farming systems of the tropics
260			_bJohn Wiley and Sons _aNew York _c1977
300			_a377
650			_acropping system
650			_anitrogen fixation
700			_aDart, P J, ed.
901			_a914
942			_2ddc _cBK
999			_c796 _d796