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*1112 $aIntegrated systems in agriculture (Seminar)$0(NO-TrBIB)90739477$_78990000
*24510$aIntegrated systems in agriculture :$bproceedings of NJF-seminar no.222, Hamar, Norway, 1.-3.12.1993$corganized by: NJF:section II - Corp Science and section IX - Agricultural Economics ; edited by John Sumelius
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*7102 $aNordiske jordbruksforskeres forening$bSeksjon IX Landbruksøkonomi$0(NO-TrBIB)90564107$_34208800
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