File:Heike Kamerlingh Onnes - 43 - Farewell to the old lecture hall, Physics laboratory (Natuurkundig Laboratorium), Steenschuur, Leiden in 1922 Behind the demonstration table is JP Kuenen.png
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Heike_Kamerlingh_Onnes_-_43_-_Farewell_to_the_old_lecture_hall,_Physics_laboratory_(Natuurkundig_Laboratorium),_Steenschuur,_Leiden_in_1922_Behind_the_demonstration_table_is_JP_Kuenen.png (400 × 293 pixels, file size: 85 KB, MIME type: image/png)