Derek Watkins' posted: Visualizing US expansion through post offices from 1700 to 1900. video post *rugenius

Derek Watkins' posted: Visualizing US expansion through post offices from 1700 to 1900.

August 11th, 2011

Created using data from the USPS Postmaster Finder with lat/long coordinates extracted from placenames through correlation with the USGS Geographic Names Information System.

More on the project here.

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