000 00286nam a2200121Ia 4500
008 220201s1980 xx 000 0 eng d
082 _bBIS
100 _aBiswas, N N
245 0 _aPrinciples of carrier communication
260 _bJ.K. Publishers
_c1980
300 _a232
942 _2ddc
999 _c23667
_d23667