Hundreds of free chess books at Google Books and Internet Archive.
By the way, to everyone on chess.com who doesn't live in the USA, and who has tried to access chess books on google books unsuccessfully after reading posts from people who say a chess book is available on googlebooks...it's not you. It's google books. The licensing that is available to USA residents is just not available to those outside the US. :(
Google has legal problems, too. Nonetheless, there are other non-American sources of old digitized books (out of copyright and with dead authors). I like this source for old magazines: http://web.telecom.cz/vaclav.kotesovec/.
He just follows me
hmm, I think I see what you mean.