Oliver Henry Leonhard
1913 - 1978 (64 years)
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| Kevin O. Knolle 1961-1982 |
| Kevin O. Knolle | |
| B: | 1 Nov 1961 |
| Harvard, McHenry County, Illinois, USA | |
| D: | 15 Jan 1982 |
| Hebron, McHenry County, Illinois, USA | |
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| Oliver Henry Leonhard 1913-1978 |
| Oliver Henry Leonhard | |
| B: | 11 Dec 1913 |
| Cleveland, Manitowoc County, Wisconsin, USA | |
| D: | 4 May 1978 |
| Woodstock, McHenry County, Illinois, USA | |
 | Mary Jean Northberg 1912-1982 |
| Mary Jean Northberg | |
| B: | 14 Jun 1912 |
| Chicago, Cook County, Illinois, USA | |
| M: | 30 Apr 1949 |
| Lake Geneva, Walworth County, Wisconsin, USA | |
| D: | 16 Jan 1982 |
| Woodstock, McHenry County, Illinois, USA | |