| Name | Role | Place | Source | |
|---|---|---|---|---|
| Henriette W. J. Baumer | Registered | 1890 | Nijmegen | Population register |
| W. A. Baumer | Registered | 1810 | Amsterdam | Notarial records |
| W. Baumer | Travelers | 1958 | New York | Passenger registers |
| W. Baumer | Travelers | 1957 | Rotterdam | Passenger registers |
| W. Baumer | Travelers | 1960 | Rotterdam | Passenger registers |
| W. Baumer | Travelers | 1961 | Rotterdam | Passenger registers |
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