Combining Texts

You have chosen 'In Defense of Essentialism' by L.A. Paul, 'The Fragmentation of Value' by Thomas Nagel and 'Mathematical Thought from Ancient to Modern Times' by Morris Kline

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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