USA Northland Directories - Publishes telephone directories for areas in Greater Minnesota, Western Wisconsin and Northern Iowa. - http://www.usanorthland.com
University Directories Online - US publisher of campus telephone directories. - http://www.universitydirectories.com
Valley Yellow Pages - Independent telephone directory publisher in California. - http://www.valleyyellowpages.com/
Directory Distributing Associates - Distributor of telephone directories from the United States, Mexico, and Canada. - http://www.ddai.com/
Hill Donnelly - Publisher of cross reference directories and CD-ROMS. - http://www.hilldonn.com
555-1212.com - Search and reverse lookup of phone numbers, addresses, maps, and area codes. Paid subscription required. - http://www.555-1212.com/