Vortrag von Michael Simml: „Wie macht ein Biobauer seine Felder fruchtbar.“

pdf -> http://www.google.at/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&ved=0CFsQFjAI&url=http%3A%2F%2Fwww.wiesenfelden.de%2Fogv-zinzenzell%2Fdateien%2FFruchtbare%2520Felder.pdf&ei=VbliUc-iMu2V7Aah9oDIBw&usg=AFQjCNGciQNoBL5y6NBNXnNXl4ofMIoJbA&sig2=GWk8yfcF4KRfs4ys3gH5Rg&bvm=bv.44770516,d.ZGU

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