Smith, J. R. G.
Elementary telecommunication practice - 3rd ed. - London The English Lnnguage book society 1967 - xii:319 p. ill.
Telecommunication : Electrical engg.
623.8 / SMI/1967
Elementary telecommunication practice - 3rd ed. - London The English Lnnguage book society 1967 - xii:319 p. ill.
Telecommunication : Electrical engg.
623.8 / SMI/1967