Combining Texts

You have chosen 'Classical Cosmology (frags)' by T.M. Robinson, 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell and 'Reference and Essence (1st edn)' by Nathan Salmon

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All the ideas for Natural Reality, or select a subheading:
      A. Classical Physics
      B. Modern Physics
      C. Space
      D. Time
      E. Cosmology
      F. Chemistry
      G. Biology