You look up the book Communications law: Liberties, restraints, and the modern media by John D. Zelezny. Quick Search shows that the book is on Tier 2 with call number KF2750 Z45 2011. When you get to Tier 2, you see these signs on the bookcases. According to these book number ranges, this book should be located:

shelf 2

Explanation:

If Quick Search shows that the book is on Tier 2 with call number KF2750 Z45 2011. When you get to Tier 2, you see these signs on the bookcases. According to these book number ranges, this book should be located on shelf 2. Using the number and the signs you see on the book shelf you trace that it is in shelf 2

So they can do what they want to do later. Vacation, a certain item, pay off mortgage etc...