| Name | Role | Place | Source | |
|---|---|---|---|---|
| Lummigjen W. Slump | Registered | 1839 | Oosterzee | Population register |
| W. Slump | Registered | 1888 | Amsterdam | Family cards |
| W. Slump | Registered | 1909 | Amsterdam | Family cards |
| W. Slump | Mention | Lemsterland | Kohieren hoofdelijke omslag | |
| W. Slump | Travelers | 1958 | Rotterdam | Passenger registers |
| W. Slump | Passagier | 1949 | Tandjong Priok | Passenger registers |
| W. Slump | Military | 's-Gravenhage | Staat van dienst | |
| W. Slump | Mention | Lemsterland | Kohieren hoofdelijke omslag | |
| W. Slump | Travelers | 1958 | New York | Passenger registers |
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