'Surface soil color' diaporamas de présentation

FFA Land Judging Using the 2005 Scorecard and Guidebook

FFA Land Judging Using the 2005 Scorecard and Guidebook. Terence H. Cooper Dept. of Soil, Water, & Climate University of Minnesota, St. Paul. Soil - the essence of life. Darkle, darkle, little grain, I wonder how you entertain a thousand creatures microscopic.

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