000 00288nam a2200121Ia 4500
008 220201s1971 xx 000 0 eng d
082 _bGRE
100 _aGreen D. C.
245 0 _aRadio and line transmission
260 _aLondon
_bPitman Publishing
_c1971
300 _a291
942 _2ddc
999 _c17374
_d17374