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