00324nam a2200097Ia 4500008004100000082004700041100002400088245006100112260004500173300000800218140113s9999    xx            000 0 und d  a"631.461.5:633.2+636"":1975""(082.2)   L6"  a"Stelly, Matthias."  aBiological Nitrogen fixation in forage-Livestock systems  a1978bAmerican Soc. of AgronomycMedison  a127