John Gilbert Koper
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John Gilbert Koper
 1922-1989
| John Gilbert Koper | |
| B: | 5 Mar 1922 | 
| Detroit, Wayne County, Michigan, USA | |
| D: | 5 Apr 1989 | 
| Henderson, Clark County, Nevada, USA | |
Betty Mae Pohl
 1925-1989
| Betty Mae Pohl | |
| B: | 20 Feb 1925 | 
| Marenisco, Gogebic County, Michigan, USA | |
| M: | 13 Jun 1942 | 
| Munising, Alger County, Michigan, USA | |
| D: | 17 May 1989 | 
| Munising, Alger County, Michigan, USA | |



