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Mentioned as the title of the Collected Works, Volume 164 by 
Rudolf Steiner
CW 164 The Value of Thinking: Lecture 9 [fifth lecture of second section] (Dornach, 4 October 1915) by Rudolf Steiner
Mentioned as the title of the lecture series being read, part of Collected Works, Volume 164.
CW 164 The Value of Thinking: Lecture 4 (Dornach, 20 September 1915) by Rudolf Steiner
