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How to Address a LetterInternational addresses will likely require a different ZIP code format starting with the country name. 3. Fill in Sender's ...
Steenburgh, Thomas J., Andrew Ainslie, and Peder Hans Engebretson. "Massively Categorical Variables: Revealing the Information in Zip Codes." Marketing Science 22, no. 1 (winter 2003): 40–57.
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