A new edition of this text is available here
AUTHORS: Salmon, Merrilee H. - ©2007
Make logic simple with INTRODUCTION TO LOGIC AND CRITICAL THINKING. Designed to be the logic textbook that you can pick up, start reading, and actually understand; this edition is your best choice. With easy-to-follow explanations and special sections that help you determine the truth-value of your own statements, INTRODUCTION TO LOGIC AND CRITICAL THINKING makes logic a snap. Get this volume today!
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