1915 - 2012 (97 år)
 | Kent Morris Flatness 1950-2018 |
| Kent Morris Flatness | |
| F: | 23 Aug 1950 |
| Montana, USA | |
| D: | 14 Apr 2018 |
| Bowman, Bowman County, North Dakota, USA | |
|
| Maurice Bertrum Flatness 1915-2012 |
| Maurice Bertrum Flatness | |
| F: | 21 Apr 1915 |
| Box Elder, Hill County, Montana, USA | |
| D: | 10 Aug 2012 |
| Bowman, Bowman County, North Dakota, USA | |
| Adair Alaine Johnson 1919-2013 |
| Adair Alaine Johnson | |
| F: | 11 Maj 1919 |
| Marmarth, Slope County, North Dakota, USA | |
| V: | 18 Apr 1942 |
| Billings, Yellowstone County, Montana, USA | |
| D: | 6 Nov 2013 |
| Hettinger, Adams County, North Dakota, USA | |
