Combining Texts

You have chosen 'Analyzing Modality' by Michael Jubien, 'Consilience' by Edmund O. Wilson and 'Letter to Shumacher' by Carl Friedrich Gauss

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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