Combining Texts

You have chosen 'A Dictionary of Political Thought' by Roger Scruton, 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell and 'Person and Object' by Roderick Chisholm

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation