The information on registered seafarers is not in all cases complete. As new sources are studied, information on engagements and medals etc. will be added to some of the already registered seafarers.
NorwaySjøforklaring, D/S Bør
Sjøforklaring DS Marvel
Folketelling 1920 for 0203 Drøbak kjøpstad: https://www.digitalarkivet.no/census/person/pf01073672001237