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View Red Book By International Telegraph and Telephone Consultative Committee.
Red Book
Red Book
By International Telegraph and Telephone Consultative Committee.
View Global telecommunications regulation By Kelley Lee 
Global telecommunications regulation
By Kelley Lee
View Open systems networking By David M. Piscitello,A. Lyman Chapin 
Open systems networking
By David M. Piscitello,A. Lyman Chapin