Steve Solomon, founder of Territorial Seeds, who wrote my favorite veg gardening book of all time, Gardening When It Counts, set up the library at http://www.soilandhealth.org/index.html.
For some of the materials a one time $10 donation to the library is requested though you can still get the book free by submitting your email address.
Here's the email I received when requesting a link to the book I wanted to read, "9,600 Miles Through The U.S.A. in a Station Wagon".
There is a message for YOU below, from Soil and Health Library:
Then the email read
The URL for your copy of 9,600 Miles Through The U.S.A. in a Station Wagon is as follows:
A copy of the item you requested has been made especially for you. To obtain it click the link above.
This link will work for only one month from today and then your copy will be removed from our server.
According to Australian library rules you are not allowed to request a copy of the same book more than once.
Please note that this link is for personal use only and may not be distributed.
So, the materials are free for the asking and I'll donate the $10 for future use of the library.