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3
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Man, technology, society and development : from the hunters and gatherers to the first industrial revolution 3,5 million years ago until AD 1760 / door Paul Ernst Lapperre.
- Technische universiteit Eindhoven,
- 1992.
- Eindhoven :
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Stoves for institutions and small industries : scale effects on costs and design / Ernst Sangen.
- Eindhoven university of technology. Department of applied physics. Woodburning systems group,
- 1988.
- Eindhoven :
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Test results on charcoal stoves from developing countries / by Ernst Sangen, Piet Visser.
- Eindhoven university of technology. Department of applied physics. Woodburning stove group,
- 1986.
- Eindhoven :