46:08duration 46 minutes 8 seconds
EPS 131 Lecture 16 (Second Part)
52:25duration 52 minutes 25 seconds
EPS 131 Lecture 16 (First Part)
47:29duration 47 minutes 29 seconds
EPS Lectures 2 (Second Part) , 3
EPS Lectures 2 (Second Part) , Lecture 3