25:51 duration 25 minutes 51 seconds
GEB4935 HSA4938 - Lesson 14_ch 14
22:19 duration 22 minutes 19 seconds
GEB4935 HSA4938 - Lesson 12_ch 11
21:38 duration 21 minutes 38 seconds
GEB4935 HSA4938 - Lesson 11_ch 10
16:10 duration 16 minutes 10 seconds
GEB4935 HSA4938 - Lesson 07_ch 5
19:48 duration 19 minutes 48 seconds
GEB4935 HSA4938 - Lesson 06_ch 4