| Name | Role | Place | Source | |
|---|---|---|---|---|
| Hendrik P. de Planque | Registered | 1922 | Amsterdam | Workforce registration |
| J. P. F. de Planque | Registered | 1849 | Leiden | |
| Jan P. de Planque | Registered | 1925 | Amsterdam | Workforce registration |
| P. H. A. de Planque | Registered | 1849 | Leiden | |
| P. H. D. de Planque | Registered | 1849 | Leiden | |
| P. de Planque | Travelers | 1939 | New York | Passenger registers |
| P. de Planque | Registered | 1901 | Amsterdam | Family cards |
| P. de Planque | Travelers | 1939 | Rotterdam | Passenger registers |
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