If you want to add this barcode for mass mailings to receive lower postal
rates, you should read "A Guide to Mailing for Businesses and Organizations"
It is available from your United States Postal Service's bulk mail facility.
Ask at your local Post Office for it's location.
You can also find it here in PDF, click on Domestic Mail Manual: http://www.usps.com/publications/manuals/welcome.htm
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