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National zip code & post office directory.

APA Citation

United States Postal Service. Retail Operations Division., United States Postal Service. National zip code & post office directory. Washington: U.S. Postal Service.

MLA Citation

United States Postal Service. Retail Operations Division, and United States Postal Service. National Zip Code & Post Office Directory. Washington: U.S. Postal Service,

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