I shared this link a long time ago in my plurk and I’m going to share it now. Since I have so few followers I don’t care.
That blog has hundreds of How to Draw books and art related stuff from software to artbooks. You can find some RARE gems there and some great highly renowned books like Andrew Loomis and Richard Williams’s The Animator’s Survival Kit.
Edit: Fixed the link lol, if it’s still not working just copy/paste http://eddiesekiguchi.blogspot.pt/ on your browser.