Combining Texts

You have chosen 'Questions on Aristotle's Physics' by John Buridan, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'The Nature of Possibility' by David M. Armstrong

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature