I found this site a few years back...
http://soilandhealth.org/
From the site:
Soil and Health Library
This website provides free downloadable e-books about radical agriculture, natural hygiene/nature cure and self-sufficient homestead living. There are secondary collections involving social criticism and transformational psychology.
There is no fee for downloading anything in this library.
The library’s topic areas connect agricultural methods to the health and lifespan of animals and humans. A study of these materials reveals how to prevent and heal disease and increase longevity, suggests how to live a more fulfilling life and reveals social forces working against that possibility.
They have a LOT of titles. They do require your email for downloading the books, but they did not fill my in box with donation requests. When searching for the site again, I found several references to the site hidden here on permies. I think it deserves it's own thread.