GA 75
| No. | Lecture Title | Book Title | Date | City | 1. | Spiritual Science. Natural Science. Technology | Not Yet Available | 17 Jun 1920 | Stockholm | 2. | Philosophical Basis for Anthroposophy | Not Yet Available | 8 Jul 1920 | Bern | 3. | Science and Anthroposphy | Not Yet Available | 4 Jun 1921 | Weimar | 4. | Science Questions | Not Yet Available | 4 Jun 1921 | Weimar | 5. | Anthroposophy and Science | Not Yet Available | 2 Nov 1921 | Basel | 6. | Agnosticism in Science and Anthroposophy | Not Yet Available | 11 May 1922 | Leipzig |
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