| Name | Role | Place | Source | |
|---|---|---|---|---|
| Harry J.H. Backus | Deceased | 1958 | Venlo | Prayer card collection |
| Hendrik J.H. Backus | Registered | 1910 | Nijmegen | Population register |
| Henri J.H. Backus | Registered | 1910 | Nijmegen | Population register |
| J.H. Backus | Travelers | 1915 | New York | Passenger registers |
| J.H. Backus | Travelers | 1915 | Rotterdam | Passenger registers |
| J.H. Backus | Military | 's-Gravenhage | Staat van dienst | |
| J.H. Backus | Travelers | 1955 | Rotterdam | Passenger registers |
| J.H. Backus | Registered | 's-Gravenhage, Heerlen | Management file | |
| J.H. Backus | Registered | 's-Gravenhage, Heerlen | Management file |
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