| Name | Role | Place | Source | |
|---|---|---|---|---|
| J.J. Block | Travelers | 1929 | New York | Passenger registers |
| J.J. Block | Military | Studbooks | ||
| J.J. Block | Military | Pension registry | ||
| Maria J.J. de Block | Registered | 1914 | Amsterdam | Workforce registration |
| Maria J.J. de Block | Registered | 1914 | Amsterdam | Workforce registration |
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