The Spiritual Background of Human History
GA 174b
| First Lecture | September 13, 1914 | |
| Second Lecture | February 13, 1915 | |
| Third Lecture | February 14, 1915 | |
| Fourth Lecture | November 22, 1915 | |
| Fifth Lecture | November 23, 1915 | |
| Sixth Lecture | November 24, 1915 | |
| Seventh Lecture | March 12, 1916 | |
| Eighth Lecture | March 15, 1916 | |
| Ninth Lecture | May 11, 1917 | |
| Tenth Lecture | May 13, 1917 | |
| Eleventh Lecture | May 15, 1918 | |
| Twelfth Lecture | February 23, 1918 | |
| Thirteenth Lecture | February 24, 1918 | |
| Fourteenth Lecture | April 23, 1918 | |
| Fifteenth Lecture | April 26, 1918 | |
| Sixteenth Lecture | March 21, 19211 |