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National zip code directory.

APA Citation

United States Postal Service. National zip code directory. [Washington]: U.S. Postal Service; [For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA Citation

United States Postal Service. National Zip Code Directory. [Washington]: U.S. Postal Service; [For sale by the Supt. of Docs., U.S. Govt. Print. Off.],

Warning: These citations may not always be complete (especially for serials).