| Name | Role | Place | Source | |
|---|---|---|---|---|
| P. Clarkson | Travelers | 1967 | Rotterdam | Passenger registers |
| P. Clarkson | Travelers | 1955 | New York | Passenger registers |
| P. Clarkson | Travelers | 1955 | Rotterdam | Passenger registers |
| P. Clarkson | Travelers | 1955 | New York | Passenger registers |
| P. Clarkson | Travelers | 1966 | New York | Passenger registers |
| P. Clarkson | Travelers | 1954 | New York | Passenger registers |
| P. Clarkson | Travelers | 1954 | New York | Passenger registers |
| Willem P. Clarkson | Registered | 1900 | Nijmegen | Population register |
| Willem P. Clarkson | Registered | 1890 | Nijmegen | Population register |
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