Combining Texts

You have chosen 'Space and Time' by Hermann Minkowski, 'The New Institutional Theory of Art' by George Dickie and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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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