File:Heike Kamerlingh Onnes - 14 - "Cyclopenhol" (Den of the Cyclopses)- the basement in the Academy Building in Groningen where Heike Kamerlingh Onnes carried out his pendulum tests.png
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Heike_Kamerlingh_Onnes_-_14_-_"Cyclopenhol"_(Den_of_the_Cyclopses)-_the_basement_in_the_Academy_Building_in_Groningen_where_Heike_Kamerlingh_Onnes_carried_out_his_pendulum_tests.png (400 × 269 pixels, file size: 111 KB, MIME type: image/png)