File:Heike Kamerlingh Onnes - 46 - Heike Kamerlingh Onnes, Niels Bohr, Hendrik Lorentz and Paul Ehrenfest (from right to left) at the second helium liquefactor, 1919 Physics laboratory (Natuurkundig Laboratorium), Steenschuur, Leiden.png
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Heike_Kamerlingh_Onnes_-_46_-_Heike_Kamerlingh_Onnes,_Niels_Bohr,_Hendrik_Lorentz_and_Paul_Ehrenfest_(from_right_to_left)_at_the_second_helium_liquefactor,_1919_Physics_laboratory_(Natuurkundig_Laboratorium),_Steenschuur,_Leiden.png (400 × 280 pixels, file size: 78 KB, MIME type: image/png)