Most books that you find using these resources will be located on the upper level of Milne Library and some will be located in Fraser's main reading room or online. Using the Library of Congress Classification System, most law books fall under the call number "K". For more detailed information visit the Library of Congress' Classification Outline for Law Materials.
The following are the best places to search when looking for Books about Law.
Google Books is a large collection of digitized books, freely available to the public. Some of the books you find here will be a limited preview, some will be full view.