books.google.com - this book represents a current look at what we know about organic farming practices and systems, primarily from the U.S. and Canadian perspectives. the discussion begins with history and certification, ecological knowledge as the foundation for sustaining food systems, and biodiversity. The next chapters...http://books.google.com/books/about/Organic_Farming.html?id=8HMfbQpNq60C&utm_source=gb-gplus-shareOrganic Farming
