Unless I'm mistaken, isn't this what an outline is? Most informational texts have these at the beginning and call them a Table of Contents. I know not all books have them, but ideally, they should have chapters, sections, and subsections allowing you to quickly find what you're looking for. These are usually combined with an index at the end that lists every relative term and where it's discussed.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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