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This book describes the cultural boundaries that define America. At least one person has created what seems to be a GIS style map from this.

Does anyone know where I can locate these files?

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    Ask the Author? colinwoodard.blogspot.ca/2015/02/… twitter @woodardcolin built on census data has changed many times. – Mapperz Apr 22 '16 at 20:35
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    Might want to check out the open data stackexchange opendata.stackexchange.com – wmebane Apr 22 '16 at 21:08
  • Ask the author for the data source or a map – PROBERT Apr 23 '16 at 0:32
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    If asking the author doesn't work and you're feeling unusually reverse engineer-y, you could write a program to determine county list from color. – barrycarter Apr 24 '16 at 15:16

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