Schauberger
[5] See figs. 6a, 6b & 7, Nature as Teacher, Vol. II of the Ecotechnology series. — Ed. [The Energy Evolution - Harnessing Free Energy from Nature, The Economy Founded on Reactively Produced Energy]

[1] See "The Ox and the Chamois" in Nature as Teacher, p.41, Vol. II of the Ecotechnology series. — Ed.] [The Energy Evolution - Harnessing Free Energy from Nature, Letter to Werner Zimmermann]

[13] See description of the north-south and west-east orientation of pipes on p. 175 of Nature as Teacher, Vol. II and in "Increase In Soil Productivity", in The Fertile Earth, Vol. III of the Ecotechnology series. — Ed. [The Energy Evolution - Harnessing Free Energy from Nature, The Liquefaction of Coal by Means of Cold Flows]