| Name | Role | Place | Source | |
|---|---|---|---|---|
| Heinrich Frederik Posthuma | Deceased | 1881 | Utrecht | Civil registration deaths |
| Heinrich Frederik Posthuma | Registered | 1806 | Utrecht | Population register |
| Heinrich Friederich Posthuma | Child | 1880 | Amersfoort | Civil registration births |
| Heinrich Friedrich Posthuma | Registered | 1806 | Amersfoort | Population register |
| Heinrich Friedrich Posthuma | Registered | 1858 | Harlingen, Amersfoort | Population register |
| Heinrich Posthuma | Tewerkgestelde | 's-Gravenhage, Amsterdam | Workforce registration |
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