character: Bill Mollison
topic: Permaculture Principles in Gardening
subject: Science
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character: Masanobu Fukuoka
topic: Natural Farming Techniques
subject: Science
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character: Elaine Ingham
topic: Soil Microbiology and Gardening
subject: Science
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character: David Holmgren
topic: Permaculture Design Principles
subject: Science
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