I subscribe to a digest of free online books.? They email me twice a month with some highlights.? I can download up to 3 at a time – full length PDF versions of the (regularly very expensive) books.? This service I subscribe to is mostly technical books, but there are some non-technical (the title in the browser is LearnIT).
Here’s the site I use:? http://www.pdfchm.com/
Create an account and login. Then search for a book you want, click on it. There’s a link at the bottom to the PDF and a short process to get the PDF.
You do need to sign up, but its a completely free resource for these very expensive books.
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