Order:
  1. Philosophical Investigations.Ludwig Josef Johann Wittgenstein - 1953 - New York, NY, USA: Wiley-Blackwell.
  2. Prototractatus: An Early Version of Tractatus Logico-Philosophicus.Ludwig Josef Johann Wittgenstein - 1971 - Ithaca: Routledge.
    Wittgenstein's _Tractatus Logico-Philosophicus_, first published in 1921, has had a profound influence on modern philosophic thought. _Prototractatus_ is a facsimile reproduction of an early version of _Tractatus_, only discovered in 1965. The original text has a parallel English translation and the text is edited to indicate all relevant deviations from the final version.
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  3. The Voices of Wittgenstein: The Vienna Circle—Ludwig Wittgenstein and Ludwig Waismann.Ludwig Josef Johann Wittgenstein & Friedrich Waismann - 2003 - London, England: Routledge.
    This work brings in both the original German and English translation of over one hundred short essays in philosophical logic and the philosophy of mind of historical importance to understanding Wittgenstein's philosophical thought and development in the 1930's. Transcribed from the papers of Friedrich Waismann and dating from 1932-35, the majority are highly important dictations by Wittgenstein to Waismann, but also includes texts of redrafted material by Waismann closely based on the dictations. Many of these texts become the ultimate sources (...)
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