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The Philosophy of Spiritual Activity ... Sixth Edition, Based on the Original Authorized Translation by Prof. and Mrs. R.F. Alfred Hoernlé, Revised and Amended by Hermann Poppelbaum

Rudolf Steiner

出版	London, 1949
URL	http://books.google.com.hk/books?id=zW5EMwEACAAJ&hl=&source=gbs_api