000 00312nam a2200121Ia 4500
008 170101s1981 xx 000 0 und d
082 _a631.5 SPE
100 _aSpedding C.R.W.
245 0 _aBiological Efficiency in Agriculture
260 _aLondon
_bAcedemic Press
_c1981
300 _a383 p.
942 _2ddc
_cB
999 _c792766
_d792766