| Name | Role | Place | Source | |
|---|---|---|---|---|
| D. v.d. Gaag | Travelers | 1958 | Rotterdam | Passenger registers |
| D. v.d. Gaag | Travelers | 1958 | New York | Passenger registers |
| D. v.d. Gaag | Travelers | 1948 | Rotterdam | Passenger registers |
| D. v.d. Gaag-Ruygers | Travelers | 1949 | Rotterdam | Passenger registers |
| Johannes D. v.d. Gaag | Registered | 1907 | Amsterdam | Workforce registration |
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