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Originally Posted by natureguy
Do you have a link from where I can download this book. Moreover the technology looks great. Please elaborate if you have more info on the topic. 
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Originally Posted by Ann Vole
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in case you do not see the link, it is earthshelters.com and you may also be able to find the book at your library or used book suppliers like Amazon
Amazon.com: Passive annual heat storage: Improving the design of earth shelters, or, How to store summer's sunshine to keep your wigwam warm all winter: John N Hait: Books