000 00291nam a2200121Ia 4500
008 220201s1977 xx 000 0 eng d
082 _bBIS
100 _aN.N. Biswas
245 0 _aPriciples of telegraphy
260 _aNew Delhi
_bAsia Publishing House
_c1977
300 _a185
942 _2ddc
999 _c17097
_d17097