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

Rudolf Steiner

出版	London; Anthroposophic Press: New York, 1939
URL	http://books.google.com.hk/books?id=rCITMwEACAAJ&hl=&source=gbs_api