Combining Texts

You have chosen 'Papers of 1918' by Bertrand Russell, 'Of Organum or Ars Magna of Thinking' by Gottfried Leibniz and 'Cardinality, Counting and Equinumerosity' by Richard G. Heck

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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