The Human Equation Toolkit book series by Eric McLuhan & Wayne Constantineau includes books The Human Equation: The Constant in Human Development from Pre-Literacy to Post-Literacy -- Book 1 The Human Equation Toolkit, The Science of Investigation: Working with Equations -Book 2 the Human Equation Toolkit, and Know Thyself: Action and Perception -Book 3 the Human Equation Toolkit. See the complete Human Equation Toolkit series book list in order, box sets or omnibus editions, and companion titles.
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