6 May 1840, Maassluis, civilmarriage Nr.5 (genlias.nl, archivelocation Stadsarchief Vlaardingen)
groom Martinus Jonkergouw, age 29, birth 30 March 1811 ‘s-Hertogenbosch, son of: Gerard Jonkergouw, Anne Catharine van der Rijdt; bride Catharina van Velzen, age 22, birth 5 Aug.1817 Maasland, daughter of: Dirk van Velzen, Jannetje Schaarman. / Info, the bride has no birthcertificate. //

28-29 March 1841 Maassluis, birthcertificate Nr.38, cert.date 29 March 1841, source genlias, archive Stadsarchief Vlaardingen: child Gerardus Jonkergouw, birth 28 March 1841 Maassluis, son of: Martinus Jonkergouw, Catharina van Velsen. //

21?-22 Sep.1842 Maassluis, genlias, birthcert.Nr.76, cert.date 22 Sep.1842: child Joanna Catharina Jonkergaauw, birth (date 31=?)?21 Sep.1842, place of birth Maassluis, daughter of: Martinus Jonkergaauw, Catharina van Velsen. //

7-9 Apr.1844 Maassluis, prov.ZH, genlias.nl, archive Stadsarchief Vlaardingen, birthcert.Nr.38, cert.date 9 Apr.1844: child Joanna Philippina Jonkergouw, birth 7 Apr.1844 Maassluis, daughter of: Martinus Jonkergouw, Catharina van Velsen. //

13 Nov.1845 Maassluis, prov.ZH, archive Stadsarchief Vlaardingen, genlias.nl, birthcert.Nr.108, date cert.13 Nov.1845, child: Matthaeus Jonkergouw, birth 13 Nov.1845 Maassluis, son of: Martinus Jonkergouw, Catharina van Velsen. //

18 Apr.1855 Maassluis, prov.ZH, source genlias.nl, archive Stadsarchief Vlaardingen, prov.ZH.:
groom Martinus Jonkergouw, age 44, birth 30 March 1811 ‘s-Hertogenbosch, son of: Gerard Jonkergouw, Anna Catharine van der Rijdt; bride Margaretha Visser, age 43, birth 31 March 1812 Maassluis, daughter of: NN (= father’s name unknown/not mentioned), and Catharina Visser (= mother’s surname: Visser). / Information groom: Widower of: Catharina van Velzen. //