Data and Code
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Newpaper.com Index (as of Oct. 15, 2018) [csv]
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Tools for Harmonizing County Boundaries [zip] [ziped csvs for all years]
Included in the zipfile is a toolbox for ArcMap, the raw python script for that tool, stata code and a readme file. Be careful when using these file to harmonize over long periods of time.
Ziped csvs for each base year: 1790, 1800, 1810, 1820, 1830, 1840, 1850, 1860, 1870, 1880, 1890, 1900, 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1980, 1990, 2000, 2010.
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Quick and Dirty Market Access (Coming Soon)