| Name | Role | Place | Source | |
|---|---|---|---|---|
| G. Joh. Slothouber | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| G. Slothouber | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| G. Slothouber | Travelers | 1951 | New York | Passenger registers |
| Janna G. Slothouber | Registered | 1890 | Nijmegen | Population register |
| Johanna G. Slothouber | Registered | 1890 | Nijmegen | Population register |
| Johanna G. Slothouber | Registered | 1910 | Nijmegen | Population register |
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