"0, . "
the british telephone system: / - 1 ed. - uk : open university 1973. - ", 132p.; 29 cm."
0 335 02604 4
--
384. 650 40 uni
the british telephone system: / - 1 ed. - uk : open university 1973. - ", 132p.; 29 cm."
0 335 02604 4
--
384. 650 40 uni