File:Hendrik Antoon Lorentz - postcard (briefkaart) to J.F. Hulk, curator art of Teylers Museum, Haarlem - 10 February 1911 - 2.jpg
![File:Hendrik Antoon Lorentz - postcard (briefkaart) to J.F. Hulk, curator art of Teylers Museum, Haarlem - 10 February 1911 - 2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Hendrik_Antoon_Lorentz_-_postcard_%28briefkaart%29_to_J.F._Hulk%2C_curator_art_of_Teylers_Museum%2C_Haarlem_-_10_February_1911_-_2.jpg/800px-Hendrik_Antoon_Lorentz_-_postcard_%28briefkaart%29_to_J.F._Hulk%2C_curator_art_of_Teylers_Museum%2C_Haarlem_-_10_February_1911_-_2.jpg?20200123140534)
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