| Name | Role | Place | Source | |
|---|---|---|---|---|
| Willem Ehrhardt | Registered | 1913 | 's-Gravenhage | Population register |
| Willem Ehrhardt | Registered | 1888 | Amsterdam | Population register |
| Willem Ehrhardt | Registered | 1913 | 's-Gravenhage | Population register |
| Willem Ehrhardt | Registered | 1888 | Amsterdam | Population register |
| Willem Ehrhardt | Registered | 's-Gravenhage | Studbooks | |
| Willem Ehrhardt | Registered | 1888 | Amsterdam | Overgenomen delen |
| Willem Ehrhardt | Deceased | 1970 | 's-Gravenhage, Amsterdam | Civil registration deaths |
| Willem Ehrhardt | Registered | Gorssel | Population register | |
| Willem Ehrhardt | Registered | 1880 | Amsterdam | Population register |
| Willem Ehrhardt | Witness | 1935 | 's-Gravenhage | Civil registration marriages |
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