000 00289nam a2200121Ia 4500
008 220201s1957 xx 000 0 eng d
082 _a621.3815
_bSEL
100 _aSelly, S.
245 0 _aElectronic tube Circuits
260 _aNew york
_bMcgraw hill
_c1957
300 _a668
942 _2ddc
999 _c13727
_d13727