There are not books per se to download here, but try perusing some of the groups and discussions. If you need help, give me a holler and tell me what you're interested in. I'll find the group links for you...it's a big place with lots of info. You can contact any admin without being on a 'friends list.'
I uploaded my pdfs in the library (like on my site:)
We have a site library but I have to add or restore books (pdf) and/or links. I have a library in some groups but had to remove my largest " sections" since the site was going to be (or already has been) renovated.
There are some books there but many are not. I have had time not to do it. It needs more than one person to work in the library. Please add what you like!
You can also ask or check many of my groups they have alibrary in the page section
I have added my pdfs to the site library. The link is also on the main page