| Name | Role | Place | Source | |
|---|---|---|---|---|
| Frederik Willem Adriaan de Kock van Leeuwen | Registered | 1915 | Heemstede | Militia records |
| Frederik Willem Adriaan de Kock van Leeuwen | Registered | 1913 | 's-Gravenhage | Population register |
| Frederik Willem Adriaan de Kock van Leeuwen | Groom | 1923 | Heemstede | Civil registration marriages |
| Frederik Willem Adriaan de Kock van Leeuwen | Conscript | 1915 | Heemstede | Militia records |
| Frederik Willem Adriaan de Kock van Leeuwen | Registered | 1913 | 's-Gravenhage | Population register |
| Frederik Willem Adriaan de Kock van Leeuwen | Child | 1895 | Den Helder | Civil registration births |
| Frederik Willem Adriaan de Kock van Leeuwen | Registered | 1901 | Heemstede | Population register |
| Frederik Willem Adriaan de Kock van Leeuwen | Registered | 's-Gravenhage, Den Helder, Heemstede | CABR dossiers |
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