You can download a number of chess books in pdf format from the following site: pdf-freedownload
Actually, this site is a bunch of links that direct you to other sites where you can view or download the books. In some cases they are old books nobody is likely going to want and in other cases they are “sample” downloads where you get 20 or 30 pages of a book from the publisher as an inducement to buy it. Many of the samples seem to be Eric Shiller books from Cardoza Publishing. From what I’ve read, most anything written by Schiller is not worth the price even if it’s free. Be that as it may, for example his book Development of a Chess Master contains 37 pages with some lessons in basic tactics…the book looks to me to be along the line of all those -------- For Dummies books. Also, some of the downloads are just catalogs.
There’s always a question about free downloads of chess books as to whether they are legal and violate copyright laws. Most sites won’t carry them if they are illegal, but some do. Bookyards is a Canadian website that follows Canadian copyright rules (far more lenient than US laws) but they still try to follow U.S. rules. Many sites don't adhere to Bookyard's standards.
Anyway, I give the link to this site in case anybody wants to poke around and maybe find something interesting.
What’s here?...My comments about chess and my pdf booklets on players and tournaments. PLUS links to sites about chess history, scholastic help, chess books (on line and downloadable), places to play chess online (real time and correspondence), Soviet chess sites, chess instruction, recommended books, chess engines, endgame databases and other really great Blogs. You will find posts about chess engines, well-known and not-so-well-known historical figures, great games and a lot of other things about chess that I have found interesting or informative. There are also posts on improvement containing subject matters like pattern recognition and how chess masters think. Most improvement advice has been gleaned from the masters themselves and psychological studies which have attempted to understand the thought process of chess masters. Be sure to take time to browse the whole Blog for interesting material. Your comments and suggestions are always welcome.