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This book shows how to build a rocket mass heater, so you can enjoy overnight comfort from a brief evening fire.
This book shows how to build a rocket mass heater, so you can enjoy overnight comfort from a brief evening fire.
This book shows how to build a rocket mass heater, so you can enjoy overnight comfort from a brief evening fire.
901 backers pledged $46,219 to help bring this project to life.
901 people are supporting Erica Wisner
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