| Name | Role | Place | Source | |
|---|---|---|---|---|
| J.M. Block | Registered | Amsterdam | Police reports | |
| J.M. Block | Registered | 1906 | Amsterdam | Passport applications |
| J.M. Block | Travelers | 1950 | Rotterdam | Passenger registers |
| J.M. Block | Passagier | 1946 | Batavia | Passenger registers |
| J.M. de Block | Registered | Amsterdam | Family cards | |
| J.M. de Block | Registered | 1922 | Amsterdam | Family cards |
| J.M. de Block | Registered | 1906 | Amsterdam | Family cards |
| J.M. de Block | Registered | 1901 | Amsterdam | Family cards |
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