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The dataset for ``uszipcode`` is from multiple source, and integrated by Sanhe Hu.

- 2012-01-22 federal governmanet zipcode data from
  http://federalgovernmentzipcodes.us/
- 2010 zcta2010 population, wage, houseunit, land, water area data from
  from http://proximityone.com/cen2010_zcta_dp.htm
- 2015-10-01 geometry google map geocoding data from http://maps.google.com
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