NHGISNational Historical Geographic Information System (University of Minnesota)
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An original motivation for this research was to demonstrate the breadth and potential utility of NHGIS U.
To capture trends preceding this turning point adequately (and to achieve a broader demonstration of the temporal range of NHGIS tract data), the study dataset extends back to 1950, stopping short of 1940 in order to leverage the increased tract coverage between those two times.
but using CDW requires nothing more than NHGIS data.