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Is there original TexBook by Knuth? Everything I've found surfing the Internet does not seem complete book, I want to learn pure plain-Tex, try it,compare its advantages and disadvantages with LaTex and so on. Sorry if it is a duplicate.
I'm from Germany and here most of the people use MS Wort, too. But still, the library of my University has multiple copies of the TeXBook around. So if there is a University around you that teaches physics, maths or something like that, chances are that it has the TeXBook.
TeX by Topic is available for free, and might be installed with your LaTeX distribution, try texdoc texbytopic from a command line/terminal. (Or get it from CTAN: ctan.org/tex-archive/info/texbytopic) The TeXbook is not available for free, though the source is also available on CTAN.
The source of the TeX Book is available for free, so you can read its code. Otherwise, you have to beg, borrow or buy a copy. (It is quite expensive, sadly.)
A note: Any links to PDF versions of The TeXbook should be flagged and will be deleted. The copyright status of the work is clear: it's not legitimately available as a PDF.
texdoc texbytopic
from a command line/terminal. (Or get it from CTAN: ctan.org/tex-archive/info/texbytopic) The TeXbook is not available for free, though the source is also available on CTAN.