Jonas Valk was a son of Jacob Valk and Frouke Jacobs.
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According to the death records of camp Sachsenhausen Jonas Valk died on 24 October 1944. It is possible this date is different from the official day of death as established after the war by the Department of Justice.
This person is commemorated on a memorial in Emmen. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.