21:38 duration 21 minutes 38 seconds
GEB4935 HSA4938 - Lesson 11_ch 10
22:52 duration 22 minutes 52 seconds
GEB4935 HSA4938 - Lesson 08_ch 6
19:48 duration 19 minutes 48 seconds
GEB4935 HSA4938 - Lesson 06_ch 4
21:41 duration 21 minutes 41 seconds
GEB4935 HSA4938 - Lesson 05_ch 3
28:34 duration 28 minutes 34 seconds
GEB4935 HSA4938 - Lesson 04_ch 2