Items where Author is "Vellinga, Theun"
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Vellinga, Theun Management and nitrogen utilisation of grassland on intensive dairy farms. [S.l. : s.n.]. ISBN 9085043735 , 2006
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Vellinga, Theun Management and nitrogen utilisation of grassland on intensive dairy farms. [S.l. : s.n.]. ISBN 9085043735 , 2006