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December 2, 2010

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http://www.basic-info-4-organic-fertilizers.com/soil.html

http://www.enviroliteracy.org/subcategory.php/36.html

http://www.epa.gov/gmpo/edresources/soil.html

http://www.davidsuzuki.org/about_us/dr_david_suzuki/article_archives/weekly08230001.asp

 

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