GA 145
| No. | Lecture Title | Book Title | Date | City | 4. | The Beginning of Spring, Easter Monday and Sunday | 23 Mar 1913 | The Hague | 1. | Lecture I | The Effect of Occult Development | 20 Mar 1913 | The Hague | 2. | Lecture II | The Effect of Occult Development | 21 Mar 1913 | The Hague | 3. | Lecture III | The Effect of Occult Development | 22 Mar 1913 | The Hague | 5. | Lecture IV | The Effect of Occult Development | 23 Mar 1913 | The Hague | 6. | Lecture V | The Effect of Occult Development | 24 Mar 1913 | The Hague | 7. | Lecture VI | The Effect of Occult Development | 25 Mar 1913 | The Hague | 8. | Lecture VII | The Effect of Occult Development | 26 Mar 1913 | The Hague | 9. | Lecture VIII | The Effect of Occult Development | 27 Mar 1913 | The Hague | 10. | Lecture IX | The Effect of Occult Development | 28 Mar 1913 | The Hague | 11. | Lecture X | The Effect of Occult Development | 29 Mar 1913 | The Hague |
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