2 books in series
Eco-Technology
Eco-Technology is a 2-book series with 2 released primary works first released in 1999 with contributions by Viktor Schauberger.
 The energy evolution : harnessing free energy from nature
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 Nature as Teacher – New Principles in the Working of Nature 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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