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Designing Letter Mail. Publication 25. Washington, DC: US Postal Service, August 1995.

Harmon, C. Lines of Communication, Bar Code and Data Collection Technology for the 90s. Petersborough, NH: Helmers Publishing, 1994.

Masunaga, D. "Zips and Strips." Student Math Notes. Reston, VA: National Council of Teachers of Mathematics, January 1994.

Palmer, R. The Bar Code Book. Petersborough, NH: Helmers Publishing, 1995.

 

U.S. Postal Service
www.usps.gov/ncsc/lookups/lookup_zip+4.html

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