Combining Texts

You have chosen 'Homeostasis, Species and Higher Taxa' by Richard Boyd, 'Counterpart theory and Quant. Modal Logic' by David Lewis and 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess

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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