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Professional and clean tables with LaTeX – texblog
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LaTeX/Tables - Wikibooks, open books for an open world
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Formatting a table with multiple headers like this? - TeX - LaTeX Stack Exchange
Multi-column and multi-row cells in LaTeX tables – texblog
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Small Guide to Making Nice Tables
Multi-column and multi-row cells in LaTeX tables – texblog
Professional and clean tables with LaTeX – texblog
Automatic line breaks in LaTeX tables – The Lazy Economist