Telegeography 1995 : global telecommunications traffic statistics & commentary / ed. Gregory C. Staple
Telegeography 1996/97 : global telecommunications traffic statistics & commentary / ed. Gregory C. Staple
Telegeography 1993 : global telecommunications traffic statistics & commentary / ed. Gregory C. Staple
Telegeography 1994 : global telecommunications traffic statistics & commentary / ed. Gregory C. Staple