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###Census tracts seem to be smaller than zip codes particularly in urban areas, so this might be a more precise unit of data
###Problem: it may be difficult (or impossible) to determine census tract for VC, Fortune 500, and Medical Centers.
##US Census Economic data
###https://www.census.gov/econ/geo-zip.html
##McNair Center data on Medical Centers, Hubs, and Accelerators
#Chronology

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