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 Which book is that? I remember reading about it. Thanks for reminding me. I am going to build one over the winter it’s a great idea for fertility but also heating the surrounding area for crops that like it warm. 
 This one… https://image.nostr.build/e943ad205575a00c06491eca29cb9f519666c149ec8f0592983985ef840b30e1.jpg  
 Nice! I don’t know that one. 
 A lot of good personal experience in it. I think they have been at it for 40+ years. 
 I’m going to get a copy. 
 Looks like I have another book to get