From Sir Karl Popper Selected correspondence between Thomas Szasz and Popper, between 1961 and 1984. http://www.szasz.com/popper.html
Language and the Body-Mind Problem Text of this 1953 paper by Popper, with hyperlinked footnotes and a later note by the author. http://www.ditext.com/popper/lbp.html
The Problem of Induction Text of this key 1953 paper, in which Popper presents the view of the scientific method as a critical, rather than inductive process. http://dieoff.org/page126.htm
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