Knowledge of the higher worlds and its attainment.
[Rendered into English by George Metaxa with revisions by Henry B. and Lisa D. Monges.
- 3d ed.]
- New York, Anthroposophic Press [1970? c1947]
- xv, 272 p. 19 cm.
Translation of Wie erlangt man Erkenntnisse der höheren Welten?