Bulk Mail Permit Procedure for the City of Rock Island
Publication 28 - Postal Addressing
http://pe.usps.com/text/pub28/welcome.htm
Quick Service Guide – Basic Standards For All Mailing Services
http://pe.usps.com/text/qsg300/Q602.htm
Acronyms and Abbreviations
https://pe.usps.com/text/pub28/28apc_002.htm