| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Jacob W. Gruber | Registered | 1832 | Amsterdam | Population register |
| Johan Jacobus W. Gruber | Registered | 1832 | Amsterdam | Population register |
| W. Gruber | Travelers | 1956 | New York | Passenger registers |
| W. Gruber | Travelers | 1956 | New York | Passenger registers |
| W. Gruber | Travelers | 1961 | New York | Passenger registers |
| W. Gruber | Travelers | 1955 | Rotterdam | Passenger registers |
| W. Gruber | Travelers | 1961 | Rotterdam | Passenger registers |
| W. Gruber | Travelers | 1956 | New York | Passenger registers |
| W. Gruber | Travelers | 1957 | Rotterdam | Passenger registers |
| W. Gruber | Registered | 's-Gravenhage, Arnhem | Management file |
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