| Name | Role | Place | Source | |
|---|---|---|---|---|
| M Heikoop | Registered | 1889 | Teteringen | Population register |
| M. Heikoop | Registered | 1894 | Amsterdam | Family cards |
| M. Heikoop | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| M. Heikoop | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| M. Heikoop | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
| M. Heikoop | Travelers | 1951 | Rotterdam | Passenger registers |
| M. Heikoop | Travelers | 1953 | Rotterdam | Passenger registers |
| M. Heikoop | Signatory | 1878 | 's-Gravenhage | Verzoekschriften |
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