- Lacks dustwr.

= With AUTOGRAPH SIGNED DEDICATION to "A.C. Crombie", signed "K.R.P." (= Karl Raimund Popper) on first free endpaper.

Idem. The Logic of Scientific Discovery. New York, Basic Books, 1959, 480p., orig. cl. w. dustwr.

= The first English language edition, translated by the author.

AND 2 duplicates of the same work, 1st English ed. (London, 1959), both without dustwr.