Jan Johannes Blanksma: ferskil tusken ferzjes

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[[Ofbyld:J.J.Jan Johannes Blanksma.jpg||250px|thumb|''Professor J.J. Blanksma'']]
 
'''Jan Johannes Blanksma''' ([[Penjum]], [[1875]] - [[1950]]) wie in Nederlânske heechlearaar [[organyske gemy]] oan de [[Universiteit Leien|Ryksuniversiteit Leien]].