| Name | Role | Place | Source | |
|---|---|---|---|---|
| Hermanus Groothaar | Deceased | 1928 | Raalte | Civil registration deaths |
| Hermanus Groothaar | Deceased | 1833 | Deventer | Civil registration deaths |
| Hermanus Johannes Groothaar | Registered | Breda | Prison registers | |
| Lambertus Groothaar | Tewerkgestelde | 's-Gravenhage | Workforce registration | |
| Lambertus Groothaar | Tewerkgestelde | 's-Gravenhage | Workforce registration | |
| Lambertus Hermanus Groothaar | Child | 1899 | Raalte | Civil registration births |
| Lambertus Hermanus Groothaar | Father | 1935 | Raalte | Civil registration deaths |
| Lambertus Hermanus Groothaar | Groom | 1924 | Raalte | Civil registration marriages |
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