- 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.
- A Realist View of Logic, Physics, and History - The next-to-last chapter of Popper's 1966 work Objective Knowledge. Contains a concise presentation of his epistemological views.
- Popper on Kantian Concept of War on War - Text of a 1993 interview giving Popper's take on the contemporary world situation.
- From Sir Karl Popper - Selected correspondence between Thomas Szasz and Popper, between 1961 and 1984.
- Prague Lecture - Speech delivered by Popper in the Czech Republic shortly before his death.
- Extracts from "The Open Society and Its Enemies" - Selected passages from this 1945 work, Popper's most well-known.
- Letter from Karl Popper - Scanned image of a 1992 letter to Kelley L. Ross.
- Against Television - An interview with Sir Karl Popper, in Italian, with an English summary.
- Language and the Body-Mind Problem - Text of this 1953 paper by Popper, with hyperlinked footnotes and a later note by the author.
- Three Worlds - A lecture delivered at the University of Michigan, April 7, 1978.
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