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John Eckfeldt

2 cilt bulundu.

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Cobb's Creek in the days of the old powder mill

Cobb's Creek in the days of the old powder mill

John W. Eckfeldt · Printed by A. H. Sickler Co.]

104 sayfa · 1917

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Appropriate technologyAppropriate technology for a sustainable futureJohn Eckfeldt

Appropriate technology for a sustainable future

John Eckfeldt · Victoria International Development Education Association

48 sayfa · 2003

Study and teaching (Secondary) / Solar energy / Design and construction / Solar ovens / Appropriate technology