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G.J. Verdam hoogleraar Wis en Natuurkunde te Leiden. en Verdam hoogleraar Wis en Natuurkunde te Leiden th century litho found online at leidenuniv nl browseall yesdocsPerPage startDoc leidenuniv nl see also nl rkd nl Dirk Jurriaan Sluyter other versions PDold Uploaded with Gideon Jan Verdam Dirk Jurriaan Sluyter