| Name | Role | Place | Source | |
|---|---|---|---|---|
| G.J. Leeuwenberg | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| G.J. Leeuwenberg | Buyer | 1715 | Leeuwarden | Deeds of sale |
| G.J. Leeuwenberg | Person in notarial deed | 1906 | Enkhuizen | Notarial records |
| LEEUWENBERG, G.J. | Partner | Delft | Population register | |
| Leonardus G.J. Leeuwenberg | Registered | 1910 | Nijmegen | Population register |
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