Chapter 1 #7,8,12,13,14,19,25,30,42
Chapter 2 #3,7,8,9,13,17,23,24,25,28,32,34,47,48,53
54 (2nd part only: Orientation of the Milky Way relative to the earth's orbit)
Chapter 3 #4,5,9,14,17,19,20,22,26,31,43
Chapter 4 #1,3,5,9,11,12,15,20,21,22,27,34,39
Chapter 5 #2,6,7(see also 44),11,14,17,18,21,27,34,41
Chapter 6 #2,3,13,16,18
Chapter 7 #1,2,5,6,9,12,14,16,20
Chapter 8 #6,7,8,14,19,25,26,27,28,30
Chapter 9 #1,3,4,7,9,10,13,16,18
Chapter 10 #4,5,8,14,19,29
Chapter 11 #3,4,7,10,11,15,19,34
Chapter 12 #2,5,9,10,14,16,20,30,31,37
Chapter 13 #1,3,10,11,16,17,23,25
Chapter 14 #3,4,7,16,18,20
Chapter 15 #1,2,6,8,10,13,16,20,22