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999 _c81921
_d81921
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008 180710s9999 xx 000 0 und d
041 _aEN
082 _a630
_bSPE
_223
100 _aSpedding., C.R.W.
245 4 _aThe biology of agricultural systems /
_cby C.R.W. Spedding
260 _aLondon
_bAcademic press
_c1975
300 _a261 pages
500 _aInclude index and glossary
509 _aNS
942 _cPR