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Prof.mr. F. de Vries prof.dr. W.E. Boerman en prof.dr. Z.W. Sneller . en Prof mr de Vries links prof dr Boerman rechts en prof dr Sneller links voor picture found online in Historisch Genootschap Roterodamum Meent de jaargang nr september author other versions px px AnonymousEU Uploaded with Willem Boerman Frans de Vries Zeger