000 00245 a2200073 4500
245 0 _aCCITT ISDN Field Trial Guidelines Handbook /
_c.
710 2 _aInternational Telecommunication Union.
_eWydawca
_4pbl
260 _aGeneva :
_bITU,
_c1991.
300 _aX, 100 s.:
_bil.;
_c30 cm.
999 _c1804
_d1804