Table:
0
A
B
C
D
E
F
G
1
Start month
End month
Cover
Spine
Indicia
Masthead
Number of issues
2
Oct–50
Aug–58
Galaxy Science Fiction
Galaxy Science Fiction
Galaxy Science Fiction
Galaxy Science Fiction
94
3
Sep–58
Oct–62
Galaxy Magazine
Galaxy Magazine
Galaxy Magazine
Galaxy Magazine
27
4
Dec–62
Dec–65
Galaxy
Galaxy
Galaxy Magazine
Galaxy Magazine
19
5
Feb–66
Sep–68
Galaxy
Galaxy
Galaxy Magazine
Galaxy Magazine
18
6
Oct–68
Oct–69
Galaxy Science Fiction Magazine
Galaxy
Galaxy Magazine
Galaxy Magazine
12
7
Nov–69
Jan–72
Galaxy Science Fiction Magazine
Galaxy
Galaxy Magazine
Galaxy Science Fiction Magazine
20
8
Mar–72
Mar–72
Galaxy Magazine
Galaxy
Galaxy Magazine
Galaxy Science Fiction Magazine
1
9
May/Jun–72
Jan–73
Galaxy Magazine
Galaxy Science Fiction
Galaxy Magazine
Galaxy Science Fiction
5
10
Mar/Apr–73
Mar/Apr–73
Galaxy
Galaxy
Galaxy Magazine
Galaxy Science Fiction Magazine
1
11
May/Jun–73
Nov–73
Galaxy
Galaxy
Galaxy
Galaxy Science Fiction
5
12
Dec–73
Dec–73
Galaxy Science Fiction
Galaxy
Galaxy
Galaxy Science Fiction Magazine
1
13
Jan–74
Jan–75
Galaxy
Galaxy
Galaxy
Galaxy Science Fiction Magazine
13
14
Feb–75
Jan–76
Galaxy
Galaxy
Galaxy Incorporating Worlds of If
Galaxy Science Fiction Magazine
9
15
Feb–76
Oct–77
Galaxy Science Fiction
Galaxy Science Fiction
Galaxy Incorporating Worlds of If
Galaxy Science Fiction
16
16
Nov–77
Dec-77/Jan–78
Galaxy
Galaxy
Galaxy Incorporating Worlds of If
Galaxy
2
17
Feb–78
Oct–79
Galaxy Science Fiction
Galaxy Science Fiction
Galaxy Incorporating Worlds of If
Galaxy Science Fiction
10
18
Summer–80
Summer–80
Galaxy
Galaxy
Galaxy
Galaxy
1

Questions and formulas:
Question: Which spine has 12 issues?
Formula: LET(query1,SUMMARIZE(D1,SUMX(G1)),FILTER(query1,CHOOSECOLS(query1,2)=12))
Formula2: LET(query1,SUMMARIZE(D2:D18,SUMX(G2:G18)),FILTER(query1,CHOOSECOLS(query1,2)=12))
Level: hard
Question: How many issues end on jan–72?
Formula: SUMIFS(G1,B1,"jan–72")
Formula2: SUMIFS(G2:G18,B2:B18,"jan–72")
Level: easy
Question: Which masthead ends on oct–69?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1="oct–69"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G18,B2:B18="oct–69"),6))
Level: medium