The Gospel of St. Mark. 10 Lectures by Rudolf Steiner given in Basel, Switzerland, September 15th to the 24th, 1912. (CW 139) Translated by Conrad Mainzer.
For your convenience, below is a zip file of this entire set of lectures. It does require that you have an unzipping utility of some kind on your computer. For you mac people this is built in.
The Entire Book of the Gospel of Mark
Lecture 1 (Basel, September 15, 1912)
Lecture 2 (Basel, September 16, 1912)
Lecture 3 (Basel, September 17, 1912)
Lecture 4 (Basel, September 18, 1912)
Lecture 5 (Basel, September 19, 1912)
Lecture 6 (Basel, September 20, 1912)
Lecture 7 (Basel, September 21, 1912)
Lecture 8 (Basel, September 22, 1912)
Lecture 9 (Basel, September 23, 1912)
Lecture 10 (Basel, September 24, 1912)