00788nam a2200205Ii 4500008004100000040001600041110003300057245015600090264004200246300006600288336002600354337002800380338002700408504004100435500002000476650003800496650003000534003000100564005001700565                                          aNUST cNUST2 aBell Telephone Laboratories.10aEngineering and operations in the Bell System /cprepared by members of the technical staff and the Technical Publication Department, Bell Laboratories 1a[New York] :bThe Laboratories,c1977  axviii, 721 pages :billustrations (some folded) maps ;c25 cm  atextbtxt2rdacontent  aunmediatedbn2rdamedia  avolumebnc2rdacarrier  aIncludes bibliographical references.  aIncludes index. 0aTelecommunicationzUnited States. 0aTelephonezUnited States.20230120144506.0