Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Karl Popper described Die Beiden Grundrpobleme der Erkenntnistheorie - The Two Fundamental Problems of Knowledge - as ' above all about... the crisis of physics. It asserts the permanence of crisis; if it is right, then crisis is the normal state of a highly developed rational science.' Finally available in English for the first time, it is a major contribution to Twentieth century philosophy.