I don't mind buying pure-text books from Amazon. That basically means novels. I don't even mind the DRM so much, as I read the book once and then don't really c

I don't mind buying pure-text books from Amazon. That basically means novels. I don't even mind the DRM so much, as I read the book once and then don't really care, and because I have almost never had problems with the fact that I have literally over a dozen Kindle devices and Kindle-app running devices. However, technical, computer, electronics, physics and math books are almost all uniformly terrible from Amazon (or even epub). These are long-term references that need a proper print layout option (PDF) and be unencumbered by DRM. A 2002 edition of Mastering Regular Expressions is virtually totally applicable today, 15 years later - but imagine if I had bought this in a DRM'd Sony version, or a Palm .prc (now part of Amazon)? I'd be SOL.