A lot of pre-1983 telco history, or "the creation of the RBOCs"

A Capsule History of the Bell System
http://www.porticus.org/bell/capsule_bell_system.html

Bell System History - The Bell System
http://www.porticus.org/bell/bellsystem_history.html

Life in the Bell System
http://www.porticus.org/bell/lifebellsystem.htm

AT&T Long Lines
http://www.porticus.org/bell/longlines.html

Bell Operating Companies
http://www.porticus.org/bell/bellopercomp.html

AT&T Divestiture
or "Breaking Up Is Hard To Do!"
http://www.porticus.org/bell/att_divestiture.html

another great site: TELEPHONE CENTRAL OFFICES
http://www.thecentraloffice.com/

AT&T Long Lines Retired Microwave sites in California
http://www.thecentraloffice.com/Microwave/microwave%20sites.htm

The History of Western Electric
http://www.porticus.org/bell/westernelectric_history.html