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![Cover for Helge Kragh · Varying Gravity: Dirac's Legacy in Cosmology and Geophysics - Science Networks. Historical Studies (Hardcover Book) [1st ed. 2016 edition] (2016)](https://imusic.b-cdn.net/images/item/original/771/9783319243771.jpg?helge-kragh-2016-varying-gravity-dirac-s-legacy-in-cosmology-and-geophysics-science-networks-historical-studies-hardcover-book&class=scaled&v=1461737249)
![Cover for Helge Kragh · 50 opdagelser (Hardcover Book) [1.º edición] (2014)](https://imusic.b-cdn.net/images/item/original/493/9788703066493.jpg?helge-kragh-2014-50-opdagelser-hardcover-book&class=scaled&v=1686521871)
![Cover for Helge Kragh · The Moon that Wasn't: The Saga of Venus' Spurious Satellite - Science Networks. Historical Studies (Hardcover Book) [2008 edition] (2008)](https://imusic.b-cdn.net/images/item/original/086/9783764389086.jpg?helge-kragh-2008-the-moon-that-wasn-t-the-saga-of-venus-spurious-satellite-science-networks-historical-studies-hardcover-book&class=scaled&v=1409479912)
