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https://en.wikipedia.org/wiki/C%C3%B3digo

https://en.wikipedia.org/wiki/C%C3%B3digo_F.A.M.A.

https://en.wikipedia.org/wiki/C%C3%B3digo_Postal

https://en.wikipedia.org/wiki/C%C3%B3digo_de_Endere%C3%A7amento_Postal

http://stuffaccountantslike.com/?p=139