| Name | Role | Place | Source | |
|---|---|---|---|---|
| W.C. Postma | Travelers | 1951 | Rotterdam | Passenger registers |
| W.C. Postma | Military | Studbooks | ||
| W.C. Postma | Travelers | 1924 | New York | Passenger registers |
| W.C. Postma | Travelers | 1921 | Rotterdam | Passenger registers |
| W.C. Postma N.V. | Registered | 1921 | Leeuwarden | Chamber of Commerce |
The term W.C. Postma appears in user-added comments on documents 1 2 3
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