Organizations, etc.
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- Catalogs.com
- Catalog University
- Grey House’s Directory of Mail Order Catalogs
- Postal Regulatory Commission
- United State Postal Service
- DMA – Data & Marketing Association
- Association for Postal Commerce (PostCom)
- National Postal Forum
- National Mail Order Association
- NEMOA – National Etailing & Mailing Organization of America
- Center for Media Research