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  1.  3
    Critical Thinking: Step by Step.Robert Cogan - 1998 - Upa.
    This book is a comprehensive introduction to critical thinking skills and the philosophical and factual bases of critical thinking.
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  2. Some Applications of Recent Logical Theory to the Problem of Non-Existence.Robert Cogan - 1972 - Dissertation, Syracuse University
     
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  3.  1
    A criticism of Sommers' language tree.Robert Cogan - 1976 - Notre Dame Journal of Formal Logic 17 (2):308-310.
  4.  1
    Critical Thinking. [REVIEW]Robert Cogan - 1988 - Teaching Philosophy 11 (3):246-250.
  5.  15
    Critical Thinking. [REVIEW]Robert Cogan - 1988 - Teaching Philosophy 11 (3):246-250.
  6.  1
    Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life, Second Edition. [REVIEW]Robert Cogan - 1976 - Teaching Philosophy 1 (4):476-481.
  7.  5
    Philosophical Problems and Arguments: An Introduction, Second Edition. [REVIEW]Robert Cogan - 1975 - Teaching Philosophy 1 (1):77-80.