This document discusses various library organization tools such as call numbers, barcodes, bookmarks, illustrations, shelf markers, spines, titles, alphabetical order, and spine labels which are used to categorize, identify, and locate books within a library collection. These tools help patrons find and check out materials.

1. call number

2. E
REY

3. barcode

5. bookmark

7. illustration

9. shelf marker

11. spine

13. title

15. alphabetical order

16. A B C D E F G

17. spine label

19. circulate