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http://www.ext.vt.edu/resources/4h/virtualfarm/dairy/dairy_lifecycle.html http://www.southwestdairyfarmers.com/highschool.sstg?id=4
1 Answers · Science & Mathematics · 25/05/2008
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http://www.ext.vt.edu/resources/4h/virtualfarm/dairy/dairy_lifecycle.html http://www.southwestdairyfarmers.com/highschool.sstg?id=4
1 Answers · Science & Mathematics · 25/05/2008