Goudsmit & Goldschmidt -- a geneasequel - Person Sheet
NameIsaac b’ Adam Koopmans 
Birth12 Jun 1816, Bolsward
Notes for Isaac b’ Adam Koopmans
also spelled Isak or Izak
he was married (21.10.1874 Groningen) to Jacoba Augustina Susanna Lillienfein (b. 18.5.1838 Batavia (=Djakarta), NO-Indie (= Indonesia)