000 00310 a2200097 4500
020 _a926104641X
920 _a92-61-04641-X
245 0 _aCCITT GAS 9 Handbook on the Digitization of Regional Networks /
_c.
710 2 _aInternational Telecommunication Union.
_eWydawca
_4pbl
260 _aGeneva :
_bITU,
_c1992.
300 _a87 s.;
_c30 cm.
999 _c1723
_d1723