Combining Texts

You have chosen 'Philosophical Explanations' by Robert Nozick, 'Walking the Tightrope of Reason' by Robert Fogelin and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge