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USGS Elevation Data
Instructions for obtaining USGS NED rasters and calculating elevation summary statistics within political boundaries (states, counties, etc.) can be found below. Requires a polygon shapefile with the political units. Data for U.S. only.
Railroad Freight Tariffs from Chicago to Midwest Counties
Data and code to accompany research note (available here) on the relationship between distance and railroad freight charges in the early twentieth century.
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