| Source: Kirkwood Historical Review (published by the Kirkwood Historical Society), 1962-2022 Location: St.L. / 05 / K636 | |
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| Last Name: | Engelhardt |
| First Name: | Rudolf |
| Middle Name: | K. |
| Volume: | XVIII |
| Issue: | 1 |
| Date of Publication: | March 1979 |
| Page: | 11 |
| Remarks: | listed in "In Memoriam" list |
