Combining Texts

You have chosen 'Theory of Knowledge (2nd edn)' by Keith Lehrer, 'Formal and Transcendental Logic' by Edmund Husserl and 'The Scientific Revolution 1500-1800' by A.R. Hall

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories