# Free intermediate level documentation

Are there any free manuals that are roughly on the level of Lamport, Mittelbach & Goossens, Kopka & Daly, etc.; more in-depth than the Not So Short Introduction to LaTeX, but not as daunting as source2e.pdf?

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`texdoc texbytopic` may be the level you are looking for.

CTAN: TeX by Topic

Explanation `texdoc`: TUG TeXdoc

As @lockstep notes this isn't about latex but about tex primitives mostly, however reading that first would go a long way to making the LaTeX sources (source2e) more readable.

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From the OP's examples I infer that the question is about LaTeX documentation. –  lockstep Apr 14 '12 at 12:10
Please provide a link to TeX By Topic instead of just writing "texdoc texbytopic", which should be written as `texdoc texbytopic` anyway. Some people reading this might not have any idea what `texdoc` is or do not have direct access to it (atm). –  Martin Scharrer Apr 14 '12 at 12:16