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Steve Diver, Biodynamic Farming & Compost Preparation, Alternative Farming Systems Guide: ATTRA, February 1999. Document textArchived 2008-05-09 at the Wayback Machine
Steve Diver, Biodynamic Farming & Compost Preparation, Alternative Farming Systems Guide: ATTRA, February 1999. Document textArchived 2008-05-09 at the Wayback Machine
Commission for Environmental Cooperation and TerraChoice Environmental Services Inc, Environmental and Other Labelling of Coffee: the role of mutual recognition, supporting cooperative action, May 2004. Document textArchived February 7, 2012, at the Wayback Machine