geologic map of north america, explanation · zma wma y2mu x2u x1ma y1ma jmu. title: geologic map...
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5000
31 30
50
10
31
9 51
4
8 45
7 12
32
48
36 11
49
25
43
19
1
16
29
34 47
40
2
56
18
52
44
6
13
17
20
23
30
46 14 15
33
35 53
42
24
22
28
21
38
39 54 57
27
3
41
26
22
16
5 55 37
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