| Name | Role | Place | Source | |
|---|---|---|---|---|
| F. Classen | Travelers | 1957 | New York | Passenger registers |
| F. Classen | Travelers | 1955 | New York | Passenger registers |
| F. Classen | Registered | 's-Gravenhage, Monschau | Management file | |
| F. Classen-Schmitz | Registered | 's-Gravenhage, Havert | Management file | |
| H. Classen, F. Knappmann, G.E. Knappmann, T.A. Schiffmann, R. Truthen, E. Ventgen) Klooster Zusters (E.H. Bluggel | Registered | 's-Gravenhage, Kerkrade | Management file | |
| Mathieu F. A. H. Classen | Registered | 1890 | Nijmegen | Population register |
| Matthijs F. Classen | Registered | 1910 | Nijmegen | Population register |
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