Combining Texts

You have chosen 'Critique of the Gotha Program' by Karl Marx, 'Identity and Reference' by Michael Lockwood and 'Conditional Assertion and Restricted Quantification' by Nuel D. Belnap

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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