000 00331nam a2200145Ia 4500
008 160615s9999 xx 000 0 und d
100 _aBISWAS(N N)
245 _aPrinciples of telegraphy
260 _bAsia Publishing House
260 _c1964
300 _ax p. + 185
942 _cBooks
999 _c4821
_d4821