"The stacks" refers to the main book shelves in any library.
In Robarts Library, for example, the stacks are on floors 9 to 13.
To find your book in the stacks
- Get the call number of an available copy of the book (ex. PR4556 .W45 2000X)
- Go to the library the book is held at (ex. E. J. Pratt Library)
- Find the book stacks (ex. see Pratt Library floor map)
- Look for the section in the stacks that has the first letters of your call number (ex. PR is found on the ground floor of Pratt Library)

For help finding any book in any library's stacks, please ask at the library's reference desk.