Let's look for the search words from the previous example: Maximum Spacing of Floor Joists in Residential Construction.
Search Word - Floors...look through the Index under the letter "F":
Got it! But we want more specific information about floor joists.
We can find that in the sub-headings under the word "Floor".
In our search for "Floors", we skimmed the sub-headings and found "framing" and "joists".
But how to interpret all of those numbers?