The following documents remain regarding Israël Katan:
an excerpt from the register of marriages in the town of Ommen, revealing that on 7 April 1937 Israël Katan, son of David Israël Katan and Antje Salomon Beek, wed Rachel de Levie, daughter of Gompel de Levie and Eva Leman
the ketubah of Israël Katan and Rachel de Levie
a statement from the mohel that their son 571638 was circumcised on 28 December 1939
a birth certificate for Israël Katan
a physician's statement that Israël Katan had been inoculated against smallpox.
Jewish Historical Museum, Documents collection, inv.nr 6291, 6295 t/m 6298
In addition, a Jokos file (number 52065) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 6161/20191).
A Liro card exists for this person or family. The original cards are kept at the Nationaal Archief (National Archive) at The Hague.