| Name | Role | Place | Source | |
|---|---|---|---|---|
| I. van Praagh | Travelers | 1957 | Rotterdam | Passenger registers |
| I. van Praagh | Registered | 1889 | Amsterdam | Family cards |
| I. van Praagh | Laatstelijk gehuwd | 1942 | Oswiecim | Dutch Government Gazette |
| M. van (I) Praagh | Registered | 's-Gravenhage | Management file |
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