| Name | Role | Place | Source | |
|---|---|---|---|---|
| Dirk R Plug | Registered | 1822 | Lemmer | Population register |
| R van de Plug | Registered | 1825 | Breda | Population register |
| R. D. Plug | Mention | 1825 | Lemsterland | Notarial records |
| R. Plug | Travelers | 1960 | Montreal | Passenger registers |
| R. Plug | Travelers | 1958 | New York | Passenger registers |
| R. Plug | Travelers | 1960 | Rotterdam | Passenger registers |
| R. Plug-Niklaszewski | Registered | 's-Gravenhage, Leiden | Management file |
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