File:IUSY-congres in RAI te Amsterdam. Relus ter Beek , voorzitter FJG, Bestanddeelnr 921-5410.jpg
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![File:IUSY-congres in RAI te Amsterdam. Relus ter Beek , voorzitter FJG, Bestanddeelnr 921-5410.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/IUSY-congres_in_RAI_te_Amsterdam._Relus_ter_Beek_%2C_voorzitter_FJG%2C_Bestanddeelnr_921-5410.jpg/800px-IUSY-congres_in_RAI_te_Amsterdam._Relus_ter_Beek_%2C_voorzitter_FJG%2C_Bestanddeelnr_921-5410.jpg?20180115195440)
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