Johan Jacob Grünfeld went to the '1e Montessorischool' in Amsterdam from 14 September 1940 to 22 July 1941. He then went to the 'Openluchtschool'.
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Johan Jacob Grünfeld went to the '1e Montessorischool' in Amsterdam from 14 September 1940 to 22 July 1941. He then went to the 'Openluchtschool'.
Addition of a visitor of the website