Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'Substances without Substrata' by N.L. Wilson

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge