Chapter 1 #7,8,12,13,14,19,21,25,30,42
Chapter 2 #3,7,8,9,12,13,17,23,24,25,28,32,34,47,48,53
54 (2nd part only: Orientation of the Milky Way relative to the earth's orbit)
Chapter 4 #12,15,19,20,21,22,23,34,39
Chapter 5 #2,6,7(see also 44),11,12,14,17,18,21,26,27,34,41
Chapter 18 #1,2,5,7,10,13,14,15,19,20,23,24,37,41
Chapter 19 #3,4,5,6,8,9,12,13,15,17,18,25,34,50,51,54
Chapter 20 #3,9,10,11,12,18,19,22,23,28
Chapter 21 #1,3,4,7,10,11,12,13,14,17,20,24
Chapter 22 #5,6,7,10,11,12,13,15,16,19
Chapter 23 #2,3,4,5,9,14,15,16,18
Chapter 24 #1,4,5,6,9,10,12,27
Chapter 25 #2,4,5,11,14,16,17,19,26,36
Chapter 26 #2,7,8,10,12,13,16,17,20,25
Chapter 27 #2,3,6,13,17,18,19
Chapter 28 #2,3,5,11,16,17,18