latex2e-reference – A reference for LaTeX in HTML
The HTML hyper-document provides a thorough (though slightly dated) discussion of LaTeX 2e.
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LaTeX reference documents
Maybe you are interested in the following packages as well.
- latex2e-help-texinfo: Unofficial reference manual covering LaTeX2ε
- upref: Ensure references are upright
- crossreference: Crossreferences within documents
- deleq: Flexible numbering of equations