Combining Texts

You have chosen 'Contrib to Critique of Hegel's Phil of Right' by Karl Marx, 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz and 'The Problem of Empty Names' by Marga Reimer

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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