Searching Rudolf Steiner Lectures by GA number (GA0199)
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- Title: Social Forms: Lecture VIII: East, Middle, West
- materialistic, physical world-view finds nitrogen and oxygen
- Title: Social Forms: Lecture X: The Tapestry of the Senses, Memory, and the Spiritual World, -or- Spiritual-Cosmic Tasks of Man
- describes oxygen, hydrogen, nitrogen, fron oxide, sodium
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