00464nam a2200145Ia 4500008004100000082001800041100002600059245004000085260004200125300001000167650001600177942000700193952010100200999001700301140113s9999    xx            000 0 und d  a631.96:574 L5  a" Spedding, G. R. W."  aThe biology of agricultural systems  b"New York : Academic Press Inc, 1975"  a261p.  aAgriculture  cBK  00104070aKYMbKYMd2014-01-13l0o631.96:574 L5pKBK2598r2014-01-13 00:00:00w2014-01-13yBK  c63452d63452