Call numbers are an alphanumerical system for organizing books for subject.
Call numbers are usually labeled on the spine of each book, towards the bottom. Thinner books will also about the call number label on the front cover, on the top left corner.
They can be read line for line:

| GT 500 - 2370 | Costume. Dress. Fashion. |
| NA | Architecture |
| NB | Sculpture |
| NC 950 - 996 | Illustration |
| NC 997 - 1003 | Commercial / Advertising Art |
| NC 1300 - 1766 | Pictorial humor, caricature, etc. |
| NC 1800-1850 | Posters |
| NC 1860 - 1896 | Greeting cards, poster cards, invitations, book jackets, etc. |
| ND | Painting |
| NE | Printmaking |
| NK | Decorative Arts, Design History (aesthetics of decorative / applied art) |
| NK 1160 - 1590 | Decoration and ornament, Design (design era summaries) |
| NK 1700 - 2195 | Interior decoration |
| NK 6700 - 6790 | Comic books, strips, etc. Graphic novels |
| TR | Photography |
| TS 195 - 198.8 | Packaging |
| TS 1300 - 1865 | Textile industries |
| T 1 - 999 | Handcrafts, Arts and Crafts (technical information on making things) |
| Z 242.9 - 264.5 | Printing: as a business, layout, paper and ink, machinery, typography, desktop publishing, presswork |
The Canadian Online Art Book Project is a growing digital library of books–all original works commissioned by the Art Canada Institute–by the country’s leading art experts on artists who have made a critical contribution to the evolution of the nation’s art history.
Combining database, archive, publisher and distributor, Library Stack connects digital materials from art, design, theory and architecture to global library cataloging systems. Items in Library Stack are indexed with both informal keywords and controlled Library of Congress vocabularies (the “Format” and “Subject” menus), and can be searched via our structured indexes, direct queries, or by browsing through Featured Stacks.