Combining Texts

You have chosen 'There are no ordinary things' by Peter Unger, 'Homeostasis, Species and Higher Taxa' by Richard Boyd and 'On Sense and Reference' by Gottlob Frege

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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