An international edition textbook has been printed or produced for distribution in markets outside of the United States, usually at a substantially lower cost. An international edition will typically share many of the same characteristics of the original edition, but vary in characteristics such as a difference ISBN, the inclusion of CD ROMs or other supplementary materials.
More information on international editions can be found in our blog, as well as this post which clarifies the legality of these editions in the United States, a matter which was unclear until recent court rulings.
An international edition will often have a different cover and will have a statement identifying it, as shown in this copy of The Principles of Physics:
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