Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'Space, Time and Deity (2 vols)' by Samuel Alexander and 'The Nature and Communication of Substance' by Gottfried Leibniz

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction