Combining Texts

You have chosen 'Problems of Knowledge' by Michael Williams, 'Letters to Burcher De Volder' by Gottfried Leibniz and 'Letter to the Editor about Bayle' by Gottfried Leibniz

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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