*Valid March 31, 2025 - May 11, 2025 at Canadian stores and at indigo.ca, while quantities last, with $30.00 or more pre-tax purchase of eligible product(s), after discounts and plum points redemptions. Minimum purchase amount excludes gift cards, plum+ memberships, Love of Reading products/donations, and shipping costs. Selection may vary between stores and online.
Mathematical Theory of Diffraction/en-ca/mathematical-theory-of-diffraction/84801B1D-EE0F-4D7D-A52C-EE7AC579AB2B.html84801B1D-EE0F-4D7D-A52C-EE7AC579AB2B