| Figure 13 | CLOSE
WINDOW  |
 |
 |
1 | |
2 | |
3 | |
4 | |
5 | |
6 | |
7 | |
8 | |
9 | |
10 | |
11 | |
12 | |
13 | |
14 | | 15 | |
16 | |
 |
Photo courtesy of Houghton, Michigan