Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'The Aim and Structure of Physical Theory' by Pierre Duhem and 'Summa' by Eustachius a Sancto Paulo

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All the ideas for Political Theory, or select a subheading:
      A. Basis of a State
      B. Nature of a State
      C. Ruling a State
      D. Ideologies