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The visualisations use a variety of open-source libraries, including Leaflet, Exhibit, JQuery, D3, Dimple, and Peoplemovin, but have been chosen and tailored specifically for spatial, temporal and personal attributes. The letters data used is drawn from the collections of the Mellon Centre for Migration Studies and the Immigration History Research Center and Archives at the University of Minnesota. More information on these collections can be found on the websites of the Mellon Centre for Migration Studies and the Immigration History Research Center and Archives.