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Cob may be a little different, but I think rammed earth construction usually has a binder mixed in it, a little cement. The soil itself is screened mixed and tamped making it a bad growing medium. I've got a book called Alternative Housebuilding by Mike McClintock on my shelf that gets into the process.
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If you would only recognize that life is hard, things would be so much easier for you.
- Louis D. Brandeis
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