| Name | Role | Place | Source | |
|---|---|---|---|---|
| August Merkel | Registered | 1913 | 's-Gravenhage | Population register |
| August Merkel | Travelers | 1912 | Rotterdam | Passenger registers |
| August Merkel | Military | Studbooks | ||
| August Merkel | Travelers | 1912 | New York | Passenger registers |
| August Merkel | Father of groom | 1910 | Rotterdam | Civil registration marriages |
| August Merkel | Father of groom | 1910 | Rotterdam | Civil registration marriages |
| August Otto Wilhelm Merkel | Registered | 1880 | Population register |
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