Combining Texts

You have chosen 'Theory of Science (4 vols)' by Bernard Bolzano, 'On the Conservation of Force' by Hermann von Helmholtz and 'Anarchy,State, and Utopia' by Robert Nozick

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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