(Notes: You may have to scroll down or right to see chart.)
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| Carl Gottfried Reinhold Jahn |
| Carl Gottfried Reinhold Jahn | |
| B: | 17 Mar 1879 |
| Hanover, Crawford, Iowa, USA | |
| D: | 18 May 1952 |
| Sioux City, Woodbury, Iowa, USA | |
| Dorothea Henrietta Timm |
| Dorothea Henrietta Timm | |
| B: | 16 May 1888 |
| Charter Oak, Crawford, Iowa, USA | |
| D: | 31 May 1957 |
| Ute, Monona, Iowa, USA | |