File:IUSY-congres in RAI te Amsterdam. Relus ter Beek , voorzitter FJG, Bestanddeelnr 921-5412.jpg
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![File:IUSY-congres in RAI te Amsterdam. Relus ter Beek , voorzitter FJG, Bestanddeelnr 921-5412.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/IUSY-congres_in_RAI_te_Amsterdam._Relus_ter_Beek_%2C_voorzitter_FJG%2C_Bestanddeelnr_921-5412.jpg/389px-IUSY-congres_in_RAI_te_Amsterdam._Relus_ter_Beek_%2C_voorzitter_FJG%2C_Bestanddeelnr_921-5412.jpg?20180115195618)
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Original file (2,389 × 3,676 pixels, file size: 1.18 MB, MIME type: image/jpeg)