Business Mailers Review - http://www.businessmailersreview.com/
IP Moves the Mail - http://www.ipmovesthemail.com/page.asp?content=startpage&g=IP_mail
Mail Moves America - http://www.mailmovesamerica.org/
AFPA - American Forest & Paper Association - http://www.afandpa.org/
Envelope Manufacturer's Association - http://www.envelope.org/
Envelope Institute of America - http://www.envelopeinstitute.org/
Forest Stewardship Council - http://www.fsc.org/
National Paper Trade Association - http://www.gonpta.com/
Sustainable Forestry Initiative - http://www.sfiprogram.org/
Domtar - http://www.domtar.com/
Glatfelter - http://www.glatfelter.com/default.aspx
International Paper - http://www.internationalpaper.com/
US Postal Service - https://www.usps.com/
Zip Codes By Address - https://tools.usps.com/go/ZipLookupAction!input.action