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The Energy Evolution – Harnessing Free Energy from Nature : Volume 4 of Renowned Environmentalist Viktor Schauberger's Eco-Technology Series
Viktor Schauberger
The Fertile Earth – Nature's Energies in Agriculture, Soil Fertilisation and Forestry : Volume 3 of Renowned Environmentalist Viktor Schauberger's Eco-Technology Series
The Water Wizard – The Extraordinary Properties of Natural Water
Nature as Teacher – New Principles in the Working of Nature : Volume 2 of Renowned Environmentalist Viktor Schauberger's Eco-Technology Series
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