# 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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I just remembered that Math mode is a comprehensive free guide to typesetting mathematics.

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texdoc texbytopic may be the level you are looking for.
Explanation texdoc: TUG TeXdoc
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