00:00And look, there's a bunch of numbers on the spine.
00:03Three, nine, and one hundred.
00:07That's the call number.
00:09It tells us exactly where to find the book.
00:13Call numbers.
00:14Help you find your book.
00:16Call numbers.
00:18Tell you where to look.
00:21When you know the number on the spine,
00:25you can find it any time.
00:27Call numbers.
